[CFD] Pseudo-Transients for Steady State CFD (Part 2) - Length and Velocity Scales

[@jessbuildstech]

Fantastic video, I was really excited for part 2 to drop! 🎉

[@user-kj3pj5oi8i]

your talk is very helpful! Thank you

[@AeroconX]

Great content! Thank you

[@BUGOCENTER]

I love your contents, but can you explain about acoustics model? And How's relation between acoustic model and viscous model? It's very interesting to watch and listen, big thanks.

[@EngLhag]

Around 11:00 and 13:40 : Shouldn't the formula be a simple cube root of the volume (with a 3, not 1/3, there)?

[@fluidmechanics101]

Ah yea, it's meant to be cube root, so either use a 3 there or just go with V^1/3

[@ting-juwei6584]

Fantastic video, could you talk about the cavitation model in CFD~ Thanks in advance!

[@fluidmechanics101]

Cavitation modeling is quite tricky. Do you actually need to model the bubbles, or do you just want to predict whether cavitation is likely? If you only care about whether cavitation is likely, you could just look at pressure contours and see where the pressure drops below the vapour pressure?

[@CFDIntech]

​@@fluidmechanics101 I think that both approaches will be very interesting to see, thanks!

[@gopinathnk]

If the solid domain is made of multi-layered material with varying thicknesses, do we select the one with min (delta t) or still consider the entire domain as one and use volume-averaged properties?

[@fluidmechanics101]

Good question. If the perturbation travels through the thickness of the material (through the layers, one by one) then you could happily use the volume average. However if the perturbation travels along the length, then take the minimum. So you will need to make a judgement. I would guess that it is mostly through the thickness, so you can use volume average

[@cwong9241]

Is it possible to lower the URF and use small pseudo time step factor to stabilise the calculation. Does it mean it will take forever to get a converged simulation? Many thanks

[@fluidmechanics101]

Yea, smaller URF or pseudo time step will just take more iterations to reach a solution. Hopefully it won't take forever! Usually if you are needing more than 5000 iterations, then something might be up with your calculation

[@cwong9241]

@@fluidmechanics101 thank you for your reply. The best channel for cfd!

[@anirbandas4201]

The link for discord grp you shared is not working.

[@fluidmechanics101]

Yea, the link keeps expiring, even when I set it to 'never expire' 😑 try this one: discord.gg/uGkUnWac9S

[@anirbandas4201]

@@fluidmechanics101 This too not working.

[@fluidmechanics101]

Strange. Try this: discord.gg/Cn37N3Qg

[@anirbandas4201]

@@fluidmechanics101 Thnks this link worked.

[@mohammaderfankarami1744]

Hi there. thanks for your useful videos. Can I have one demand? Could you please create video about sparse matrix and the way which modern cfd codes use that to store the matrix elements and solve the problem?

[@fluidmechanics101]

Good suggestion. I will add it to my list 😊

[@mohammaderfankarami1744]

@@fluidmechanics101 Thank you so much.

[@شهرزاد-ك4ك]

Dear sir. Spatial discretisation schemes for the convective fluxes like Roe scheme. And AUSM scheme using only in. The inviscid flow (Euler equations) or used for the compressible RANS equations . Answer me please and sorry for wasting your time 🥺

[@SaurabhKumar-lg8gv]

u have a discord grp could you share its link if it's not member's only

[@fluidmechanics101]

discord.gg/uGkUnWac9S