[CFD] Pyramids, Prisms & Stair-Stepping

Рет қаралды 8,209

Күн бұрын

An overview of how unstructured meshes are generated in CFD, covering pyramids, top cap, prisms and stair-stepping.
Time Stamps
0:00 Introduction
2:16 Inflation Layers
6:02 Top Cap
7:23 Pyramids & Tetrahedra
8:48 Poor Quality Pyramids
13:41 Surface Mesh Size
16:55 Graded Surface Mesh
20:12 Structured/Swept Regions
25:02 Stair-Stepping
29:58 Summary
31:28 Outro
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Disclaimer
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The methods, algorithms, equations, formulae, diagrams and explanations in this talk are for educational and demonstrative purposes only. They should never be used to analyse, design, accredit or validate real scientific / engineering / mathematical structures and flow systems. For such applications, appropriate trained, qualified and accredited (SQEP) engineers / scientists should be consulted along with the appropriate documentation, procedures and engineering standards. Furthermore, the information contained within this talk has not been verified, peer reviewed or checked in any way and is likely to contain several errors. It is therefore not appropriate to use this talk itself (or any of the algorithms, equations, formulae, diagrams and explanations contained within this talk) as an academic or technical reference. The reader should consult the original references and follow the verification and validation processes adopted by your company / institution when carrying out engineering calculations and analyses. Fluid Mechanics 101 and Dr. Aidan Wimshurst are not accountable or liable in any form for the use or misuse of the information contained in this talk beyond the specific educational and demonstrative purposes for which it was intended.

Пікірлер: 36

@nepali36642 Жыл бұрын

What an absolute legend! Eventhough, I am not related to this subject, I am just amazed by the flow of information you provide through your videos Here in India, people just shout on their videos and repeat unnecessary things and make learning very stressful. You have just motivated me to do a video series on my subject topics in your style.

@nicotrivium 3 ай бұрын

Dude, you are the CFD GOAT... thanks for everything!!

@francootaola9172 Жыл бұрын

Yes yes yes. Please pleeeease more videos about meshing. So many things to cove regarding meshing, I would love to ask for the trending in preferred meshing approaches today, polyhedral meshing, hexahedral with cut cell structured meshing. Specially the later, how block cutting complex geometries, I have not found any (and by any I mean really any) source to learn how to block cut complex 3d geometries (any source of documentation to learn about this would be much appreciated )...in any case much love ❤️❤️

@fluidmechanics101 Жыл бұрын

Lots of meshing content to come this year! It's going to be an awesome year

@hardiksharda9673 Жыл бұрын

@@fluidmechanics101 Woohoo 🤘🏻

@markmateo7074 Жыл бұрын

Let's gooo!! 🤘😎🤘

@ConnorSmithBirch Жыл бұрын

These sort of videos with knowledge that's only found in people's heads or company notes are the best! Thankyou!

@1992Nereida Жыл бұрын

Another video that is absolutely fantastic! Love your channel :) Would love to watch more videos focusing on meshing and mesh convergence analysis.

@sergniko Жыл бұрын

Of course we want more of these videos!

@EclecticVibe Жыл бұрын

Thank you for another great explanation!

@jloudefonty3231 Жыл бұрын

Clear illustration, thank you

@sirishprakashbaskar8784 Жыл бұрын

Excellent content Sir. Follow a lot of your videos which are very informative..

@yavuzaks1348 11 ай бұрын

High-quality information and presentation as always.

@user-oz6ow5qr1o Жыл бұрын

Thanks Dr. Aiden for the good explanation. For meshing can we have a talk on dynamic meshing methods: smoothing, layering, …. Also looking forward for pressure based Vs density based solvers. What is happening behind the seen? and what should we use? Up to what speed can we use pressure based solver? Stability in both solvers?

Жыл бұрын

Well done! Thanks.

@AhmedSamir-xt1cz Жыл бұрын

thank you, very informative and concise injection

@DiegoAndrade Жыл бұрын

bravo again!

@BobBeatski71 Жыл бұрын

One useful technique I used when learning to implement SnappyHexMesh was to have a square tube with rounded corners, the tube width decreases along the length of the tube. Eg start of tube is 10x10cm with 1cm chamfer. End of tube is 5x5cm with 0.5cm chamfer. This causes the meshing tool some headaches as it tries to match the changing radius the further down the tube it meshes. Once completed, use ParaView to create a slice animation viewing square-on in 2D. The result is a bit like a brain CAT scan. I used this technique to see just where my meshing parameters began to fail

@sanjaykumaryadav3186 Жыл бұрын

Yes we want more videos

@gauravshrivas2090 Жыл бұрын

more videos like this please.

@chrisb7161 Жыл бұрын

Great content as usual! I’d love more videos on this material. Maybe a pros and cons of structured vs unstructured grids. I personally love how much faster structured hex grids typically run in fluent and how much less memory they require. Also you can use a coarser hex grid while running a third order QUICK scheme to make up for the coarseness to a degree :)

@fluidmechanics101 Жыл бұрын

Yes, I really want to dive into meshing a bit more this year. I think it is a massive topic with lots of interesting features to talk about

@elifyldrm7736 Жыл бұрын

Thank you a lot for keeping basic explanation of importants points of CFD :)

@cwong9241 Жыл бұрын

Thank you for your useful presentation. Do you think the gap between structured and unstructured mesh is reducing and we can have more confidence on solving CFD problem using unstructured mesh? Thanks

@fluidmechanics101 Жыл бұрын

... personally I think that unstructured meshes have been demonized unfairly over the years and the reasons why structured meshes are 'better' have been forgotten or ignored. They are both good in different areas of a complex model. The 'best meshes' nowadays often use a mixture of both! Over the next few videos I want to actually cover these reasons in more detail, so you can see that it is not as easy as 'structured is best'. There are definitely scenarios where structured meshes are actually worse! (Stay tuned 🙂)

@cwong9241 Жыл бұрын

@@fluidmechanics101thank you for your reply. I am definitely looking forward to these series of videos! Thanks

@chenguangzhang8292 Жыл бұрын

Great work as always. I am a bit curious that your slides are dated July 2023.

@fluidmechanics101 Жыл бұрын

I actually planned to release this lecture later this year (July) but have brought it forward to January. I am releasing some more meshing content soon and I thought it better to release this one earlier this year to help explain the more advanced meshing. Hopefully it will be worth it!

@buhatmarccarlson832 Жыл бұрын

Awesome vid. Does this apply to FEA?

@fluidmechanics101 Жыл бұрын

Good question. Honestly I don't know. Really this is a specific issue for finite volume CFD

@anudeepgupta3799 Жыл бұрын

Hola, the way I see Pyramids in mesh has been changed after watching this video from you, i want to know some more detailed discussion why people will tell, more count in pyramids will give convergence issues., detailed talk on this will be well appreciated in advance.

@fluidmechanics101 Жыл бұрын

If you ever go to Egypt, you will never look at the great pyramids the same again ...