hello i want to simulate combustion of liquid sulfur in a furnace my mesh size is about 2 millions the liquid sulfur is pulverised into furnace as vapor i want to model the injection with discrete phase and non-premixed combustion model so whats the accurate DPM interval value for this simulation
@subhosamanta37434 ай бұрын
Dear Sir, The tutorial is a very detailed one. In order to practice the tutorial, where can we get the relevant case and data files?
@saskhkh61244 ай бұрын
Great job
@caufieldholden2775 ай бұрын
sir, i have a question: in real model, the fan has a case, why you don't add it in your cfd stimulation ?
@alphaomegaproductdevelopme3234 ай бұрын
@caufieldholden277 This is just to prove capabilities of Ansys Fluent to model a fan. The computational domain is selected in a way that we only look at the bulk flow rotation cause of the fan blades, but if wall effects are significant, we can definitely make part of the surrounding wall as the fan enclosure and include the boundary layers in the simulation too.
@Knowledgepoin156 ай бұрын
Hello, Can you make a video on LES and DES models on similar concepts?
@Knowledgepoin156 ай бұрын
I am also interested in paid course
@cfduser8 ай бұрын
Thanks, this is the first video I’ve found that actually showed all the key steps including importing geometry in one sitting, instead of a 75 part series 😂
@drashar8418 ай бұрын
can we use adaptive meshing for species transport model for chemical reactions?
@haydaryahya5158 Жыл бұрын
Thank you for the great video, can you please make video about how to set the time stepping in transient simulation especially in rotating model
@johncondon1273 Жыл бұрын
Great video! I am very interested in learning more about selecting the best materials at the best cost in my product design! Thanks for the insights!
@binhtranvan1401 Жыл бұрын
Hi. I've tried to regenerate this simulation. However, my final animation doesn't have a smooth and fine water appearance like yours, it shows exactly the scene-1 iso-contour. May I miss any settings?
@alphaomegaproductdevelopme323 Жыл бұрын
There are some practices to make a better animation in FLUENT. Modifying the lighting option can change the final animation, defining proper contour for the surface, as well as proper export settings for the final rendering all have effects on the animation. Also, CFD-post is very powerful when it comes to creating visually realistic animations.
@rahmatkermani1522 Жыл бұрын
Thank you for the great educational video.
@alphaomegaproductdevelopme323 Жыл бұрын
Thank you for your feedback!
@raihanhadijulio399 Жыл бұрын
Thank you for your helpful video. I want to ask, I only have a data of fan velocity of 7.5 m/s. Is that possible to input velocity fan and leave the pressure at 0 Pa ? Is it will be working ? I just want a static fan velocity which has value of 7.5 m/s.
@alphaomegaproductdevelopme323 Жыл бұрын
Thank you for your question - yes, you can change the pressure and velocity to any desired value and do the simulation.
@mechengineer8312 Жыл бұрын
Can you please share the exact usage of Fluent Vs CFX? I am getting confused. Why ansys has both options if you get solution from anyone?
@alphaomegaproductdevelopme323 Жыл бұрын
Thank you for your question - both FLUENT and CFX are advanced CFD tools with a wide range of applications. Fluent provides a wide range of simulation capabilities, including multi-phase flow, turbulence, combustion, and more. CFX, on the other hand performs better when it comes to turbomachinery, but still can be used for simulating complex flow problems, including high-Reynolds number flows, turbulent flows, and multiphase flows. The way they handle the problem computationally is also different. The choice between them will depend on the specific requirements of the simulation problem and user’s experience.
@madhukarrapaka2 жыл бұрын
Is the Adaptive mesh feature works for complicated VOF cases as well??
@alphaomegaproductdevelopme3232 жыл бұрын
Thanks for your question - Yes, Adaptive meshing can be applied to complicated VOF simulations as well.
@sunnysihag79362 жыл бұрын
Can you share video of post processing of this simulation shown in begining
@xa42332 жыл бұрын
is it compatible with fluid structure interaction ?
@alphaomegaproductdevelopme3232 жыл бұрын
PUMA is not available for FSI yet, because Polyhedral mesh is not compatible with Mechanical at this moment.
@markkeating35222 жыл бұрын
AMR is not required in other 3D hydraulics VOF codes for such cases with maintained accuracy. Neither is the requirement to solve for the gas phase.
@alesh5762 жыл бұрын
Amazing video!!. thanks for sharing the knowledge. Can you please make a video about internal fan?
@alphaomegaproductdevelopme3232 жыл бұрын
You're welcome! The presented solutions are applicable to other fans as well. We will soon upload more videos in our channel. Stay tuned!
@Oscar-jg9gg2 жыл бұрын
Why did they have to revamp the geometry portion? I can’t find anything anymore! >:(
@alphaomegaproductdevelopme3232 жыл бұрын
Oscar, please send us an email and explain what might be missing and we would be happy to assist you.
@Oscar-jg9gg2 жыл бұрын
@@alphaomegaproductdevelopme323 thank you for replying, but I had actually been opening the wrong thing on the context menu of geometry… sorry about that 😅🙂
@mercurial1522 жыл бұрын
can u describe boundary condition in detail ?
@alphaomegaproductdevelopme3232 жыл бұрын
Thank you for your question. The boundary conditions are all standard default wall. The problem was just initialized with the water column in the tank.
@drury2d82 жыл бұрын
What happens on the cloud when the solver unexpectedly terminates due to error? Is the subscription lost and you lose credits? Also , what is number of nodes, slide 16? Is it a cluster of processors?
@alphaomegaproductdevelopme3232 жыл бұрын
If a solve is terminated due to unexpected downtime - then a credit can be requested. If a solve is terminated due to any other reason - then the elastic currency (subscription) is consumed and will not be credited
@wilfredkane91493 жыл бұрын
How’s it going?! Liked the video, good job. Did you consider using PromoSM to increase your subs??
@musicvideo45393 жыл бұрын
Nothing beyond getting started? :(
@kaungmyat72903 жыл бұрын
I requested to use ansys cloud trial. But they don't allow to use for student or personal email. I don't know why(?
@alphaomegaproductdevelopme3233 жыл бұрын
Phillip, thank you so much for commenting here, Ansys Cloud trial is not yet available for students or personal use but stay tuned!
@johncondon12733 жыл бұрын
This is amazing! This can really make a difference in shortening the product development workflow!
@alphaomegaproductdevelopme3233 жыл бұрын
Thanks John, we are happy you think so, feel free to send us an email for a free trial!
@alphaomegaproductdevelopme3233 жыл бұрын
Looking forward to it!
@kaungmyat72903 жыл бұрын
I applied to use ansys cloud trial, but they don't allow this service for student .I don't know Why? Let me know, how to submit to get cloud service
@alphaomegaproductdevelopme3233 жыл бұрын
Good job, Milad! Very informative - keep up the great work!
@hamedmehrvlogs3 жыл бұрын
That's a great detailed tutorial. Love it! How many mesh elements did you have? Please also share the details of your simulation machine and the simulation clock time. Thank you.
@alphaomegaproductdevelopme3233 жыл бұрын
Please see the description for more information related to this tutorial. The base mesh number was 50,753 cells. For 2 seconds of simulation time, using 112 Cores and 8 nodes (in ANSYS Cloud), the computation took about five hours.
@punkisinthedetails14702 жыл бұрын
The Adaptive mesh must be computationally heavy to take 5 hours on just 50,000 cells on 112 cores. Did you use Ansys elastic cloud?
@pedrohmr223 жыл бұрын
Thank you.
@denghongzhou37853 жыл бұрын
Hello, thanks for this great video. Could you explain a little bit on how to apply adaptive mesh if Eulerian model is applied rather than VOF? I found the adaptive mesh button is grey when I selected the Eulerian model. But as you showed in this video, it works well with VOF. Thank you.
@alphaomegaproductdevelopme3233 жыл бұрын
The multiphase VOF mesh adaption is unavailable in Eulerian model, and therefore, you cannot select anything from "Predefined Criteria". Perhaps, in the future release, there will be some built-in mesh adaption for Eulerian model. Remember that VOF and Eulerian models are based on two different approaches of solving momentum and continuity equations. However, you should be able to manually apply mesh adaption in Eulerian model. You need to first create a new "Field Variable" under cell registers, and then active the dynamic mesh adaption under "Adaption Control". Please refer to the mixing elbow example (the 1st example) in Ansys Fluent Tutorial for the detailed information.
@denghongzhou37853 жыл бұрын
@@alphaomegaproductdevelopme323 Thank you.
@user-tf1fb5cx1x3 жыл бұрын
I subcribe already bro, hello bro can you help me? I stuck in a cooling tower simulation for a long time still don know how to solve, thank a lot if you can help me.
@alphaomegaproductdevelopme3233 жыл бұрын
Hi, the purpose of this channel is to give an example of the technology. If you would like for a consulting engagement - I recommend that your contact your local ANSYS Channel Partner.
@user-ml7ps3rf4u3 жыл бұрын
Thank you, Sir. What is the difference between this method and PUMA?
@alphaomegaproductdevelopme3233 жыл бұрын
It's essentially the same. In the past, automatic adaptive mesh refinement was not possible for polyhedral cells. But now, when you use multi-phase adaptive mesh, Fluent automatically uses polyhedral unstructured mesh adaptation (PUMA).
@ahmedriyadhali48903 жыл бұрын
So this service is not for every student apparently. I created an account and not able to subscribe to any service.
@alphaomegaproductdevelopme3233 жыл бұрын
If you want to have access to cloud feel free to send us an email and we will be happy to assist you and provide an evaluation key.
@ahmedriyadhali48903 жыл бұрын
@@alphaomegaproductdevelopme323 Thanks a lot. What I really want is to get elastic research ansys fluent license and use cloud hpc for running simulations. I am using ansys free student version currently as I am graduated now. So is there an answer to my question?
@ndibakarareddy2363 жыл бұрын
How many hours did it take to complete for 2 seconds??? Mine is of 48 cores , still I approximated to 56 days from what numbers I got in the console. Total of 40,000,00 iterations and could complete only 56,200 in 18 hours. I used the same dimensions roughly and mesh size. I had to terminate after 18 hours. 56 days are so long! Please tell me how much time your pc took for 2 seconds.
@alphaomegaproductdevelopme3233 жыл бұрын
It shouldn’t take that much time. Did you use parallel simulation? Be careful about recording the animation. I selected the animation to be recorded in every 0.001 s of flow-time (NOT time step), to avoid generating too much output. This will not only consume lower RAM, but also significantly increase the computational time. Also, make sure that you use a proper dimension. My domain dimension was 100mm*200mm. I actually used ANSYS Cloud for the computation. Using 112 Cores and 8 nodes, it took me less than five hours for 2 simulation seconds. If you want to know more about Ansys Cloud, please visit this video: kzfaq.info/get/bejne/iK2miZCQ09q3pp8.html
@ndibakarareddy2363 жыл бұрын
@@alphaomegaproductdevelopme323 thank you so much. That helped me a lot. I used the parallel simulation. But went for every time step solution animation, I think this is the reason for massive hours. Thanks for your response 😊.
@tejeshreddy10553 жыл бұрын
Tq u so much for the video ♥️.
@alphaomegaproductdevelopme3233 жыл бұрын
Of course, let us know if you have any questions!
@tejeshreddy10553 жыл бұрын
@@alphaomegaproductdevelopme323 I have a doubt if this simulation has baffle with holes do we need to define contact or just same process?
@alphaomegaproductdevelopme3233 жыл бұрын
@@tejeshreddy1055 The simulation process will be essentially the same. No need to define contact. The only thing you may consider is to refine your mesh near the holes by adding local sizing in the pre-processing.
@tejeshreddy10553 жыл бұрын
@@alphaomegaproductdevelopme323 on doing so I am unable to see animation if time step is 0.0001 but I am able to see pressure contours and if time step is given 0.01 then simulation gets stopped after 20 iterations. 1. Should I need to refine my mesh more ? My current mesh size is 1mm at all edges And default at remaining surfaces. Thankyou sir/madam for your reply
@alphaomegaproductdevelopme3233 жыл бұрын
@@tejeshreddy1055 Instead of a fixed time step, you may use the "Adaptive Multiphase-Specific" time step as shown in this video. This method adjusts the time step based on the Courant number in each iteration. In addition, this type of simulation (multiphase + dynamic mesh) is a heavy computation and generates huge amounts of data and requires high RAM, so if you are having difficulty to see the animation, it might be related to the hardware capability. You can try selecting “In Memory” or “HSF File” for storage type in Animation Definition to see how it works. And regarding your mesh size, as long as you have a good mesh quality (Minimum Orthogonal Quality>0.1 and Mesh Skewness<0.7) you can proceed to the solution mode.
@neelshah14523 жыл бұрын
It is really a great informative video. Could you please share me your case file or the geometry file as I am working on VOF-DPM transition modelling? Email ID:- [email protected]
@janweggen76063 жыл бұрын
Thanks for the really nice step-by-step explanation!! Could you please comment on two settings you did? 1.Why did you chose k-omega model? I would assume the flow is mainly laminar, or am I wrong? 2. Why did you chose explicit VOF formulation? From my experience the implicit formulation is much faster and also reliable. Thank you very much for your reply.
@alphaomegaproductdevelopme3233 жыл бұрын
Turbulence model is selected because the flow is locally turbulent, especially at the initial moments where the water column hits the obstacle. The explicit VOF formulation was used to allow using geometric-reconstruction scheme to capture clear, crisp interface without numerical diffusion. In addition to that, explicit scheme generally has better numerical accuracy than implicit scheme. Let me know if this helps.
@janweggen76063 жыл бұрын
@@alphaomegaproductdevelopme323 Thank you for your reply! That helps a lot. Regarding the turbulence, how did you determine if the flow is locally turbulent? Was that an assumption or have you calculated that theoretically? I have a similar problem and I am not sure if the laminar model is adequate to use (overall the flow is laminar according the Reynolds number)
@alphaomegaproductdevelopme3233 жыл бұрын
@@janweggen7606 The assumption of the mentioned locally-turbulent flow is more intuitive in this case and it comes from the nature of flow features when it suddenly hits solid obstacles. In addition to that, a rough calculation of Reynolds number using the initial water column height (H), and maximum velocity of sqrt(g*H) shows that it exceeds the critical value for channel flows. Therefore, the assumption of turbulent flow seems to be more realistic in this case. It is worth to mention that since the main purpose of this tutorial was to demonstrate the multi-phase adaptive meshing technique, the other settings related to the model setup are not probably the best choice and can certainly be enhanced. For example, the model can be fine-tuned by testing laminar flow or choosing some other turbulence models and compared to the existing experimental data or theoretical results.
@janweggen76063 жыл бұрын
Thanks for your comment on that! That helped a lot.
Rafiq - thanks for your request - I would be happy to share the file with you - can you send me your email address to [email protected].
@Anurag-sq4yc3 жыл бұрын
zone-surface: cannot create surface from sliding interface zone. Creating empty surface. Can I know why this happens
@alphaomegaproductdevelopme3233 жыл бұрын
Is this error related to the tutorial presented in this video? If so, in which step you got that error?
@Popocandy_3 жыл бұрын
if i would like the tank to rotate how am I suppose to set the condition, please? BTW thank you so much for this video!
@alphaomegaproductdevelopme3233 жыл бұрын
Under wall boundary conditions, you can set "wall motion" as "moving wall" instead of the stationary wall, and prescribe the absolute "rotational speed" as well as the "rotation-axis origin" and "direction". Note that, you need to assign the same rotational speed and rotational axis direction for all walls. But carefully assign the different rotational axis origin to the walls so that the entire tank rotates properly. For rotating flows, due to the large pressure variations, "PRESTO" or "Body Force Weighted" should be used for the spatial discretization. Also, unlike this example where we are interested in the transient behavior, if you are looking for the steady-state behavior of a rotating flow, the better approach is to enable the "frame motion" under cell zone conditions, and set the rotational velocity there. And then, set the walls to be stationary relative to the adjacent cell zone. Let me know if this helps.
@Popocandy_3 жыл бұрын
Alpha Omega Product Development Systems Thank you so much for your reply! (I actually use this program to study the water flow in a hollow sphere that rotate around Y and Z axis with the velocity 100 rpm, containing water in a half of its volume: in case you want to know.) I had run the calculations already before I saw your reply (TT) I went for the Cell Zone Condition and used the mesh motion ( Will the result come out okay?) with the velocity 100 rpm right now my computer still calculating the solution.... I’ve been waiting for 2 days! Does it take such a long time like this? And due to your reply I understand more about frame motion and the other ways to control the rotation many thanks 🙏
@alphaomegaproductdevelopme3233 жыл бұрын
@@Popocandy_ n general, the transient simulation of two-phase flow in combination with frame/mesh motion should be computationally expensive, and therefore you need to consider your computational resource to handle this simulation. If you are using the adaptive mesh, I would suggest you make a coarser base mesh. For more information about the rotating domain simulation in Fluent and how to set up such models, please refer to the chapter 10-12 in the Fluent User’s Guide. Regarding the time - you could consider adding HPC or using the ANSYS Cloud offering.
@Popocandy_3 жыл бұрын
Alpha Omega Product Development Systems You are so helpful! Thank you so much! And one last question how did you record the animation in that water color and such a smooth surface? My calculation is done but in my solution animation the water surface is sooo rough... or I did something wrong (U__U)
@alphaomegaproductdevelopme3233 жыл бұрын
@@Popocandy_ All the post-processing has been done using CFD-Post. When using the Iso-surface, I would suggest assigning a value of 0.99 or 0.01 (instead of 1 or 0) for air or water volume fraction to get a smoother interface. You can choose the water color using the constant mode in the color tab under the details of the Isosurface window. In addition, you can use the volume rendering option in CFD-Post by choosing the water volume fraction as the variable.
@muhammads.nour-eldin49493 жыл бұрын
very good tutorial. could you send me the geometry file ??
Hello, thanks for such an informative video, but I would like to request you to answer one question. What are the boundary conditions, PV-Coupling Scheme, and URF values that you have set for this calculation? You have not used the energy equation, is it necessary or not?
@alphaomegaproductdevelopme3233 жыл бұрын
Thanks for watching our video. Boundary conditions are all no-slip walls. SIMPLE method was used for pressure-velocity coupling. Under-relaxation factors are all the default values of VOF method: Pressure: 0.3, Density: 1, Body forces: 1, Momentum 0.7, Turbulent Kinetic Energy: 0.8, Specific Dissipation Rate: 0.8, Turbulent Viscosity: 1 Since this is an isothermal example and we were not interested in temperature and heat transfer calculation, the energy equation was not used in this particular tutorial.
@I_am_Rathore4 жыл бұрын
Can one assign desirable CPU and Cores settings? Also, what are the charges to use Ansys Cloud?
@alphaomegaproductdevelopme3234 жыл бұрын
Thanks for watching our video, yes you can customize your desirable CPU. You can just a an email to [email protected] and we can give you all the details you need.
@I_am_Rathore4 жыл бұрын
@@alphaomegaproductdevelopme323 Thank you so much. I will write a mail to the given address.
@varanasisaisubhankar87854 жыл бұрын
Can you please tell me how to use this feature in Ansys 18/19?
@alphaomegaproductdevelopme3234 жыл бұрын
This specific multiphase VOF predefined dynamic adaption is available after ANSYS 2020 release. For the prior versions, the user needs to go through several other manual tasks for VOF dynamic mesh adaptation. You need to enable the "Refine and Coarsen" options in the "Gradient Adaption" dialog box. Please see Chapter 30 of the Fluent User's Guide (2019) and go through Dynamic Gradient Adaption Approach (see Section 30.4.1).
@alphaomegaproductdevelopme3234 жыл бұрын
This specific multiphase VOF predefined dynamic adaption is available after ANSYS 2020 release. For the prior versions, the user needs to go through several other manual tasks for VOF dynamic mesh adaptation. You need to enable the "Refine and Coarsen" options in the "Gradient Adaption" dialog box. Please see Chapter 29 of the Fluent 18.0 User's Guide (Dynamic Adaption) and in particular, see Section 29.4 for Dynamic Gradient Adaption.
@varanasisaisubhankar87854 жыл бұрын
@@alphaomegaproductdevelopme323 Hello, I tried to follow the steps given in the manual, but I am unable to refine the mesh dynamically. I need to have 6 layers of refinement near the interface at time instances. Can you please guide me through the steps for Fluent 18?
@alphaomegaproductdevelopme3234 жыл бұрын
@@varanasisaisubhankar8785 I haven't done this specific dynamic mesh adaption in Fluent 18 before. It is highly recommended to update to Fluent 2020. However, you should be able to do that by following the similar steps described in section 3.4.9 of the below tutorial for Fluent 18 (see pages 192-195). Copy this link and put it in your browser: users.abo.fi/rzevenho/ansys%20fluent%2018%20tutorial%20guide.pdf The above example uses the "curvature" of "temperature" for mesh adaption, but for VOF simulation, you may select "Gradient" for method and select "phase volume fraction" instead of temperature and also enable Dynamic in the Dynamic tab of the Gradient Adaption dialog box (pg. 193). Please also make sure to specify a proper value for both refine and corasen threshold. This should work and dynamically refine the mesh, if the rest of your VOF model is properly set up.
@I_am_Rathore4 жыл бұрын
Thank you very much for this step-by-step video tutorial on FLUENT, really helpful. Also, can we perform the same in ANSYS 19.0 version?
@alphaomegaproductdevelopme3234 жыл бұрын
This specific multiphase VOF predefined dynamic adaption is available after ANSYS 2020 release. For the prior versions, the user needs to go through several other manual tasks for VOF dynamic mesh adaptation. You need to enable the "Refine and Coarsen" options in the "Gradient Adaption" dialog box. Please see Chapter 30 of the Fluent User's Guide (2019) and go through Dynamic Gradient Adaption Approach (see Section 30.4.1).
@RowdyRathore224 жыл бұрын
@@alphaomegaproductdevelopme323 much praise for your kind response. I was trying to figure out the procedure for Dynamic/adaptive mesh in my VOF model and with the help of your assistance I will finally be able to do it.
@user-gu3gz6ej9w8 ай бұрын
@@alphaomegaproductdevelopme323 I've been using version 2023R2, and boy it seems the VOF adaptive mesh is much more cumbersome and super unintuitive. It isn't activated by default (even with VOF multiphase setting) unlike in the previous versions, and there's no clear instruction to do so (not even in the manual). Looks like a bug but who knows.
@miladdarzi25974 жыл бұрын
Great Video!
@alphaomegaproductdevelopme3234 жыл бұрын
Glad you enjoyed it
@roberthays50174 жыл бұрын
Warping Factor and Warping Angle both are pretty hard to calculate, thanks for sharing this!
@alphaomegaproductdevelopme3234 жыл бұрын
Glad it was helpful!
@saurabhtalele15374 жыл бұрын
Sir knowledge about meshing quality is just awesome... 🤩🙌
@alphaomegaproductdevelopme3234 жыл бұрын
Glad you liked it. Make sure to subscribe to our KZfaq Channel, we try to post good, technical and informative videos.