SOLIDWORKS Flow Simulation - Going Deeper Into Your CFD Analysis

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SOLIDWORKS Flow Simulation - Going Deeper Into Your CFD Analysis

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11 жыл бұрын

www.goengineer....
Learn some of the less-used but extremely powerful capabilities of SOLIDWORKS Flow Simulation. Included demonstrations will utilize the power of: a particle study, rotating reference frames and a parametric analysis. Product Webinar video presented by Andrew Gross of GoEngineer.
About GoEngineer: GoEnginneer delivers software, technology and expertise that enable companies to unlock innovation and deliver better products faster. With more than 30 years experience and thousands of customers in high-tech, medical, machine design, energy and other industries, GoEngineer provides best-in-class design solutions from SOLIDWORKS, Stratasys, CAMWorks and Agile PLM.
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Пікірлер: 126

@piotrszalczynski83 6 жыл бұрын

26:30 - If the mass of the helicopter is 0.034 kg it means that to take off you need at least 0.034 * 9.81 = 0.3354 [N] of thrust. If the rotors give combined 0.112 N it means you do not even have power to take off not to mention to achieve any acceleration.

@goengineer 6 жыл бұрын

Hi Piotr, Yes, you are correct.

@ybharoochi 2 жыл бұрын

Particle study 4:36 Rotating reference frames and thrust 18:05 Parametric study 28:21

@S.... 9 жыл бұрын

Awesome! Realy hard to find good rotating element tutorial. And that last part, analysis - didnt even know it exist and I have been manually doing many tests to find best solution! Thank you very much!

@IreBrezOvire 9 жыл бұрын

This tutorial / explanation is amazing! Everything is clear as the sky after a good rain. There aren't many good ones, but this one stands out.

@alwynhartman5521 11 жыл бұрын

Dear Mr. Andrew Gross, This video was good in that it showed many people (me included) how to use the software more effectively. Parametric studies truly are well welcome! However, there is a fundamental flaw in the second simulation concerning the interpretation of data from helicopter model. The amount of thrust generated is not enough to overcome the weight of the model itself. The correct formula is NOT F=ma but (for vertical moving objects acting against gravity) is F=ma+mg or F=m(a+g).

@shadowraven137 9 жыл бұрын

beautiful presentation, currently doing a final year engineering project and this has helped my group out a ton optimizing our design. (our supervisor didnt even know about that last part) thanks guys.

@Mohammad12765 8 жыл бұрын

I am so amazed to see how powerful is solidworks, I wll definitely try by myself, many thanks it was very helpful

@catmechanic1261 6 жыл бұрын

Precise and well explained. Will use tidbits for an analysis I am working on now. Thank you...Keep'em coming..!

@goengineer 6 жыл бұрын

Positive feedback! Thank you for watching and be sure to subscribe if you haven't already.

@PolioVitruvius 7 жыл бұрын

Great presentation, thanks. Interesting that you would reduce the air flow instead of simply extending the outlet tube to the center of the cylinder.

@jigneshsavaliya4703 Жыл бұрын

Excellent 👌, need more webinar on FEA

@muhammadalsaadawy8684 4 жыл бұрын

one of the best tutorial that I have ever seen thanks a lot

@arianabedi 11 жыл бұрын

Hey thanks a lot guys at GoEngineer these videos are great, shame there aren't much tutorials on SW.

@sevenssable 11 жыл бұрын

Thank you goengineer! for sharing your wisdom;) i hope some day SolidWorks will add motion to parts caused by interaction with the flow and free flow like Liquid movement within tanks.

@tradermarker423 3 жыл бұрын

I have a question. How to plot FFT for frequency power spectrum density in flow past cylinder vortex shedding.

@kennedymarsan 10 ай бұрын

Can water absorption simulation on the pad be done in Solidworks?

@rameshkumark.7312 2 жыл бұрын

IS IT REQUIRE TO CREATE LID FOR BOUNDARY CONDITIONS ? PLEASE, CLRIFY.

@josephwelch7991 7 жыл бұрын

I have a problem that perhaps you could help with? I have a gas sensing unit that uses a pump to suck in air at a certain pressure and I want to see how the amount of air it sucks in changes with turbulent conditions around it, essentially putting it in a wind tunnel. However I can't seem to set up the suction pressure of the sensor unit within the wind tunnel test section. How would you go about doing that? Great video by the way, best guide I've seen on youtube.

@goengineer 6 жыл бұрын

Hi Joseph, Your situation is somewhat more complex than could be helped in the comments section of our KZfaq channel. You would be advised to contact the technical support team of your SOLIDWORKS VAR for assistance on how to setup such a situation.

@maxamedyasinsicid2629 8 жыл бұрын

nice vifeo and good job you doing for the world, you are like heroes guys truely.

@inspiredserge6604 8 жыл бұрын

Thanks for the presentation. I think that the helicopter acceleration calculation is not right - you didn't take into account the gravity. Lifting force needs to overcome the gravity force, which is m*g=0.034[kg]*9.8[N/kg]=0.33[N]. So the "good RPM" should provide force bigger than 0.33[N]+0.034[kg]*3[N/kg]. (3[m/s^2] requires 3[N/kg]). Please check. Regards

@goengineer 6 жыл бұрын

Yes, indeed there was an oversight there. The helicopter definitely wouldn't take off.

@spacemansabs 9 жыл бұрын

I tried to recreate the hopper example but under surface parameters I didn't have the number of particles option to check, even in more options. I used an volume Airflow value in m^3/s not air speed. Does that have an effect on my options?

@muhdallifahad649 4 жыл бұрын

Hello sir, how to change flow direction? My parts has same origin like your model but my flow directions follow Y axis start from bottom to upper blade.

@paijobrother5703 6 жыл бұрын

I know flow rate which is going to strike the pelton bucket and I want to know the rpm after it strikes the bucket, can this be done in solidworks 17? Thanks

@rustybenson8284 9 жыл бұрын

Using the parametric study option, is there a way to find a minimum or maximum for a goal? I'm testing the drag on a race car and want to minimize the force in the negative x direction (maximum value).

@borret_ 9 жыл бұрын

With the secant method it's using you cant do this easily. I would just use a stepped input as opposed to a range. Then you can create a smaller range after you figure out where the sign of the result is not changing and narrow in on the result which could end up where the sign changes. Example: I created a range input of a sports car wing from -.2rads to .75 rads. At the end of the range, the values are very small. 35 pounds of downforce and it never reaches my target of 300 pounds. With a step input it finds a bunch of values in between with it appearing the largest value near 0 rads. We can assume that this is the maximum in this case, or you could do a tighter range near zero with a smaller step. You dont set a target in the step case.

@aedteam4618 9 жыл бұрын

Great video, it helped me a lot! But as stated Alwyn Hartman a year ago, the amount of thrust generated is not enough to overcome the weight of the model itself. I tested this simulation with a model of a working quadcopter. I got almost the same results. The thrust would not be enough to lift the drone. What could be the problem? Or am I missing something?

@goengineer 6 жыл бұрын

Hi AED Team, I am unsure where the source of the dependency may lie but it is always worth checking an analysis for mesh independence (reducing the mesh cell size until the results no longer change). Ultimately this question is too complex to answer in the comments section of KZfaq. You would be advised to contact your local SOLIDWORKS support VAR in order to open an investigation of your model to see if a problem exists with its setup or with the program itself.

@buddhaVSkafka 8 жыл бұрын

Are there any high energy particle simulations that can be run for geodesics in a toroid for a fusion tokamak?

@borret_ 9 жыл бұрын

Was there a button you had to select in order to create the design points as new configurations? Mine did not show the parametric configurations after analysis.

@borret_ 9 жыл бұрын

Answered my own question. It is not automatic. You have to right click on each point and select create new project.

@swagesport1 9 жыл бұрын

should the heli weight be in Newtons and not kilo's? very good video!

@goengineer 6 жыл бұрын

Hi David, Force measurements in Newtons is definitely more technically accurate but referring to this measurement in kilos is more practically understood. This is similar to how pounds are both a measure of force (lbf) and mass (lbm) in imperial units but not quite the same. Yes, measuring the force would probably make more sense.

@guicapone2 10 жыл бұрын

Hey really nice introduction to ghetto power kg solidworks. I'm genuinely impressed by its capability. Just a thought ran into my mind on the catalytic converter is that how would your measure the lifespan of it using soldworks

@fiqrydarwansyah5751 4 жыл бұрын

Such a good simulation, but why did you put static pressure on output of the fluid? Could you explain me more please..

@goengineer 4 жыл бұрын

Please contact our tech support team at goengineer.com/contact

@alihaider82 9 жыл бұрын

If the zone is moving in ClockWise direction, then what will be the rotation direction of the blade? I simulated a helicopter rotor blade in Fluent: When the blade incidence angle is positive (trailing edge down), rotor goes negative lift and airflow going up instead of going down but reverse in case of negative blade incidence? why?

@goengineer 7 жыл бұрын

Since the rotating region is actually moving the air across the blades rather than having the blade itself move through the air the rotating region direction is the opposite of the direction the blade would be moving in. It sounds like the same is true of Fluent. In that setup you are seeing the air spill off the blade in the wrong direction so the rotating region should be reversed.

@Hdjskks 4 жыл бұрын

Really hard to find rotating region how to select

@wukehongli 9 жыл бұрын

Useful video for me, i wonder if the flow simulation can simulate the polymer in the extrusion die, if yes , can you share some tutorial? thank you for your wonderful video again!

@goengineer 6 жыл бұрын

Hi wukehongli, Flow Simulation is designed for somewhat less viscous fluids then an extruded polymer. However, with the release of 2018 and free fluid surfaces it may now be possible to put in extremely viscous fluid parameters and do this. We have not seen an specific testing to that affect though.

@user-Clint315 10 жыл бұрын

Hi there, Your video is most helpful. I am trying to calculate the thrust generated on a counter-rotating propeller inside a shrouded duct. Basically the same as you have here except with the addition of a duct and I am running in the horizontal axis. My only concern is when I run the simulation my surface goals are "invalid" and result in a zero value. I am unsure what I have done wrong. Any suggestion will be appreciated.

@goengineer 6 жыл бұрын

Hi Clint, Such an error might occur if a face has been selected that is not bordering the fluid domain.

@malcolmneme6924 3 жыл бұрын

Hi, How do you choose your starting point for the flow trajectories?. Do you choose the plane parallel to the Y axis? Thanks for the video btw

@goengineer 3 жыл бұрын

You can choose any face, edge, or vertex in the flow region. Often the Boundary Conditions are good faces to select. Hope this helps!

@aobr3005 9 жыл бұрын

hi andrew, congratulations this tuto was very useful, but I have a question Does the particles inside the hopper accumulate or they simply dissapear? thanks in advance

@goengineer 7 жыл бұрын

In the particle study would reveal how many of your particles are leaving versus entering your system. The difference is your accumulation of particles that stay in the hopper.

@dashcamvigilante8739 9 жыл бұрын

How do you create the rotating regions as I have created the parts via insert > component > new part. However when I try and assign them for the rotating regions I get an error message "cannot find associated bodies with this feature' Any Help?

@goengineer 6 жыл бұрын

Hi Gee, We are unsure why exactly this is happening to you. From here we would encourage you to contact your local SOLIDWORKS VAR for assistance diagnosing the issue.

@fadoobaba 11 жыл бұрын

thickness he asked, i ave same question too! you replied about dia!

@alexandrpetrov1110 4 жыл бұрын

Thanks!

@ScottHoiland 10 жыл бұрын

This is great! Good job.

@cagicagicagi 7 жыл бұрын

VERY USEFUL! THANK YOU

@goengineer 7 жыл бұрын

Thank you Ali, for watching. Be sure to share with others.

@zip7806 10 жыл бұрын

The fins in your catalytic converter could be splayed out for maximum efficiency.

@fifthheaven 9 жыл бұрын

i keep getting select at least 1 parameter, i dont understand the problem

@fadoobaba 10 жыл бұрын

how can we calculate wind turbine blade rpm at a particular speed using flow simulation?

@joeyjones6348 6 жыл бұрын

is heli on GrabCad or anything?

@kkggmistry 3 жыл бұрын

From many time i am searching fluid simulation (Mass fraction of water) inside the Rotating Region, but not found, Can you please do the same if possible, thanks

@goengineer 3 жыл бұрын

Hello, this is a new feature for SOLIDWORKS 2021 so stay tuned! Be sure to subscribe for more great 3D CAD Design tutorials.

@kkggmistry 3 жыл бұрын

@@goengineer You mean to say, it will come in Solidwork 2021,??

@goengineer 3 жыл бұрын

@@kkggmistry Yes, it is currently in SOLIDWORKS 2021!

@kkggmistry 3 жыл бұрын

@@goengineer Thanks if you have 2021 Editions, then can you please show one flow simulation inside the rotating Drums with any dimension you like Thanks Again

@PauloRCLopes1 11 жыл бұрын

Hey, Thank you very much for this video, it helps a lot to break this irrational barrier of just using few tools from fluid simulation. I came across a problem using time dependency. Do you know if it is possible to add motion to parts in function of the physical time, that are not in the boundary limits (same as a valve)!

@goengineer 7 жыл бұрын

In the Flow Simulation calculation none of the bodies can necessarily move. Things like rotating regions actually have the solid portions of the model remain static while the air is made to move around them. In this way the setup simulates how the air would react to a moving blade but it is the air that is moving and not the blade.

@giulianotorres4556 6 жыл бұрын

why velocity plot colors inside rotating region does not match contour colors outside rotating frame? that makes the results to look doubtful. I can't find a way to solve that issue.

@goengineer 6 жыл бұрын

Hi Giuliano, I am unsure what exactly you are referring to with this question. What is the time code of this video are you looking at and can you expound on what you mean?

@giulianotorres4556 6 жыл бұрын

GoEngineer for example, look at 23:30...there at the boundary of the lower rotating frame, you can see that colors doesn't always match... there is a part where cut plot shows yellow inside rotating region, just by the boundary, but inside rotating frame...however, right there at the same point, but outside the rotating frame, it shows a green color. It sudenly changes color (so also velocity), just over rotating frame boundaries.

@goengineer 6 жыл бұрын

Giuliano, I asked around about the discontinuity that you pointed out and there were no apparent answers for it. If you would like to pursue it further, you may want to send a screen capture, or link to this video, to your local SOLIDWORKS VAR (www.solidworks.com/sw/purchase/varlocator.htm ) so they can open a service request with SOLIDWORKS Corp to answer the question.

@giulianotorres4556 6 жыл бұрын

GoEngineer yeah sure i'll do. I don't really know if it is a graphic card compatibility issue or just a mesh stuff. I also have notice when you local mesh the boundary with a high quality mesh, the plot becomes smoother and smoother, depending on how high level you use.

@jamiyansurenbekhbat697 8 жыл бұрын

Congrats!!! how to show components?

@SanthoshKumar-bm9kh 9 жыл бұрын

i customized my menu and added flow simulation but i did something ( reset to factory defaults i guess) that i cannot find the flow simulation option the next time even in the customize option. where and how can i find flow simulation option. please help me

@SanthoshKumar-bm9kh 9 жыл бұрын

i was using solidworks and i customized and added flow simulation menu but for some reason the next time is opened solidworks flow simulation option was not there. so i clicked on the customize option and the flow simualtion option was there along with the FEATURES and other options but it cannot be seen. so i tried to delete it and then again add it but after i deleted it i cannot find the flow simulation option even in the customize option. how can i add flow simulation now?

@SanthoshKumar-bm9kh 9 жыл бұрын

it worked. thank you so much

@SanthoshKumar-bm9kh 8 жыл бұрын

+GoEngineer KZfaq can i mail you about the simulation that i am doing. need loads of help please .

@BrunoFFC93 10 жыл бұрын

Hello! First of all, congratulations and thank you very much for this video, it's really amazing and helpful! I'm trying to reproduce the Catalytic Converter problem, but I'm having trouble in a part that seems pretty easy: to select the angle in the Parametric Study. When I click in "Add Dimension Parameter", the box "Add Parameter" opens in the right side; until there, it's alright. But then, when I open the sketch to select the angle to be optimized, it just doesn't happen. If I click in the angle with the left button once, the Property Manager tab opens in the left side; and If I click in the angle twice, the box to chance the angle's value opens. Could you help me, please? How should I select the angle to be optimized? Thank you.

@goengineer 6 жыл бұрын

Hi Bruno, As with most tech support inquiries your question is too complex to answer in the comments of a KZfaq channel. For this type of inquiry you would want to contact the tech support department at your local SOLIDWORKS VAR for help diagnosing this behavior.

@salnash6881 10 жыл бұрын

Could you please teach how to design water channel with water flowing in it? or a dam? because there is no such video on the net. tnx

@goengineer 7 жыл бұрын

Such a setup would not be possible in Flow Simulation. Flow Simulation is not able to run calculations where a liquid and a gas share the same fluid domain. That is to say it cannot work with systems that have a free surface of liquid with air above it. That is a limitation in the software. EDIT: As of version 2018 the user of free liquid surfaces is now a capability of the program.

@Lilo17x 9 жыл бұрын

***** First off, thanks for this great and resourceful video! I had a question regarding the RC-Helicopter. When setting up wizard, in the page where we set it to "External" and "Rotating Regions" , in the bottom left the ask for the axis, I noticed you continued with X-Axis. Should we switch it to Y-Axis?

@goengineer 6 жыл бұрын

Hi Lilo17x, I believe that was an oversight in the broadcast of this webinar. The axis of rotation should be the Y-axis for the blades of this helicopter.

@Tigermasch 9 жыл бұрын

Perfect!!!!!!!!!!! Awesome !!!!! Thank you ... Grazie Mille !!!!

@zebiiawan 11 жыл бұрын

When we make rotating region, does the thickness of the region plays any difference ?

@goengineer 6 жыл бұрын

Hi Zebi, Yes, the thickness of the rotating region can impact the results. For this reason you would want the rotating region to encompass the object that is spinning but not extend much further than that.

@gz779 6 жыл бұрын

how do you create a disk that can be hidden and not affect the aircrew part ? thank you

@goengineer 6 жыл бұрын

Hi Griffin, The way the program controls what bodies impact the flow field or not is through "Component Control". You can see this dialog at 29:11 in this video. kzfaq.info/get/bejne/rdxkmtmk1NCvfqM.htmlm11s Creating the body then disabling it in "Component Control" will allow flow to pass through it.

@gz779 6 жыл бұрын

got it, thank you!

@gz779 6 жыл бұрын

one more question, on 20:23 i saw parts list including part1 , part2 , part3. I do not know how to generate sub part like that, cause i need to create disk like part to rotate.

@goengineer 6 жыл бұрын

Griffin, These components are probably made "In-Context" in the assembly. That would mean they went to 'Insert', 'Component', 'New Part' to create a new part work space then placed a revolve feature into that part by editing it directly from within the assembly. That way the disk can be positioned exactly on top of the rotor blades for this analysis.

@FranzBond007 6 жыл бұрын

DOES IT HAS THE SAME ENGINEER RELIABILITY AS ANSYS FLUENT? how to know if it is a real tool and not just a beautiful animation? Thanks for your video!

@goengineer 6 жыл бұрын

Hi FranzAF, SOLIDWORKS Flow Simulation comes complete with validation problems that show Flow Simulation matches against known analytical solutions. The model files are located here in your installation: C:\Program Files\SOLIDWORKS Corp 2018\SOLIDWORKS Flow Simulation\Validation Examples ...and the PDF that describes each validation problem is found here: C:\Program Files\SOLIDWORKS Corp 2018\SOLIDWORKS Flow Simulation\lang\english\Docs\validations.PDF

@FranzBond007 6 жыл бұрын

Great!!!! Thank you for this information Im doing my thesis focused in the design of an axial compressor Ansys CFX or Fluent gives me the same reliability as Flow Simulation to create research data such as airfoil cascade parameters?

@FranzBond007 6 жыл бұрын

Interaction??

@goengineer 6 жыл бұрын

Excellent path in studies. Thanks for watching.

@spartanxtemplar 11 жыл бұрын

First of all, this video was amazing and very helpful for setting up my problem. I am having an issue with a rotor blade, however, and maybe you can help. I have followed the video to set up a rotating region and everything. and I am getting the error "There is no fluid volume in the project. Please check geometry or boundary conditions." Even though I have air selected and no necessary boundary conditions (well at least ones that I couldn't find from your similar model. Please help if you can!

@goengineer 7 жыл бұрын

This would be an odd error to see for an external flow projects. It is something commonly seen with internal flow projects though. You may wish to check the general settings in this project and make sure it is not set to be internal on accident.

@fadoobaba 11 жыл бұрын

beautiful!

@projetstssi2748 7 жыл бұрын

hello sir, as a high school teacher, i have my students working on very similar rc models and i d love to propose to them to work on your cfd simulation : could you provide me with the SW model of the helicopter and eventually with the flow simulation itself ? thanks

@goengineer 6 жыл бұрын

Hi projets tssi, We don't maintain a library of the files used in these videos so, unfortunately, I am unable to supply links for you to have these files.

@willTryAgainTmrw 9 жыл бұрын

very nice and informative subscribed. i am looking to do some project in my final year engineering, any suggestions anyone?

@fadoobaba 9 жыл бұрын

if we multiply this thrust by radius of the blades, we'll get torque right?

@fadoobaba 9 жыл бұрын

So how would you decide how much power you need from the electric motor? Or what motor to use?

@fadoobaba 9 жыл бұрын

or power required to spin the rotor at the rpm you used.

@projetstssi2748 7 жыл бұрын

hmm, one question about : kzfaq.info/get/bejne/rdxkmtmk1NCvfqM.html at 26:03 if the helicopter mass is 0.034kg, then its weight is : m x g = 0.034 x 9.81 = 0.33 N then the 0.112 N calculated thrust can not keep more than one third of helicopter airborne, can it ?... or can someone tell me where i am wrong ???

@goengineer 7 жыл бұрын

Yes, you are correct. Since the thrust force from the blades is 3 times less than the weight of the helicopter it would not be able to take off from the ground. It seems clear that this helicopter is in need of some kind of redesign. The overall process to analyze the helicopter is sound though. It would have kept this design from going to manufacturing as it is here.

@congkhacnguyen8972 7 жыл бұрын

Can you tell me please what kind of laptop used?

@goengineer 6 жыл бұрын

Hi Cong, At the time this video was recorded our techs were using Dell Precision M4700 laptops with NVidia Quadro graphics cards. These more recently have been replaced by Dell Precision 5520 laptops with NVidia Quadro graphics cards in them.

@nitinb3340 10 жыл бұрын

great

@ilc15341 10 жыл бұрын

Thank you, very nice video, keep it up ;)

@fadoobaba 7 жыл бұрын

how to tell CFD results are reliable? Without experimental data.

@goengineer 6 жыл бұрын

Hi fadoobaba, The only way to check if the Flow Simulation results are of good quality is to reduce the mesh cell size and see if the results change. At the point where the mesh cell size can be reduced and the results no longer change the solution has converged to the limits of the applied boundaries. Whether this applies to the real life analog though is up to the judgement of the analyst.

@LauBuk 10 жыл бұрын

Hi, anybody knows how to rotate my rotor in the animation? thank you!

@LauBuk 9 жыл бұрын

thanks sooo much

@jaminben9385 9 жыл бұрын

***** thanks for guiding me. i have been long time to why the rotor is not rotating. but i can do lessen burden from you. i don't know how is thanks

@goengineer 7 жыл бұрын

Due to how Flow Simulation runs the calculation for a rotating region you would not see the rotor rotating. In this analysis the solid portions of the model are static (including the rotor). Rotating regions applied around the rotors cause the air to spin in that region and deflect off the rotors giving an effect of how the rotor would redirect the air. The result is that the rotor itself is not moving but instead the air moves around the rotor.

@enesuzunoglu6348 6 жыл бұрын

Can you take me this videos solidworks data?

@ibbz6932 5 жыл бұрын

WOW!!!

@goengineer 5 жыл бұрын

Thanks! We hope you enjoyed the video.

@MrAmoslemi 8 жыл бұрын

Good training video but I think your engineer made a mistake calculating the helicopter acceleration since he didn't consider the weight of helicopter since with this thrust force it cannot even be lifted!

@goengineer 6 жыл бұрын

Yes, indeed there was an oversight there. The helicopter definitely wouldn't take off.

@denisl2760 9 жыл бұрын

in 10 years all mechanical engineers will be replaced by software any marketing major could use

@sanjursan 9 жыл бұрын

Denis Lipatnikov GIGO

@fadoobaba 9 жыл бұрын

Denis Lipatnikov marketing major people will never be able to optimize the designs. Those engineers who use these software are often or more than often asked to optimize the product analyzed based on some design goals, you need engineering knowledge for that! I don't think a marketing major would ever understand principle stresses or even basic thermo/aerodynamics like entropy or lift theories etc. for example, that's why they are marketing major in the first place. Marketing people talk well, just talk well. They don't know the technical side of the thing, I guess the best move by MS was to appoint Nadella the CEO he is a designer, a CS guy not a marketer.