[lam]

Hi all,

I need to know if anybody has already implemented a simple Stockes equation? (without the non-linear term)



Lam

[msrinath80]

Check out potentialFoam.

Another related discussion thread: http://www.cfd-online.com/OpenFOAM_D...es/1/2765.html

[msrinath80]

My Apologies. potentialFoam is the opposite of what you want. Check that other thread instead.

[lam]

Hi pUIl,

Thank you to reply me.

Indeed, I think taht I found how to have a simple Stockes:

I removed "div(phi,U)" term in the simpleFoam.

Of course, I made it after studying precisely the code with DoxyGen.
I'm quite sure that I have my STOCKES solver, now.

Hope that somebody does tell me if I'm wrong.

Cheers,

Lam

[msrinath80]

Do a quick validation. Stokesian flow past a fixed sphere. There are analytical expressions you can compare your numerical results with.

[lam]

Hi pUII,

Thnaks to give this information.
I've tried to find the ananlytical expression but I've not found it.
Can you tell in which paper I can find it?

THanks in advance pUII,

Lam

[msrinath80]

Compare your velocity/pressure fields with any of the analytical expressions[1,2]. Alternately, you could try using the liftDrag utility to estimate the net drag force on the sphere and compare it with the usual expression:

Fd = 6 * pi * dynamic viscosity * radius * free_stream_velocity

[1] http://scienceworld.wolfram.com/phys...lowSphere.html

[2] http://web.mit.edu/fluids-modules/ww.../2-5Stokes.pdf

[lam]

Ok, pUII!

I think this the right way to check.

Thanks again.

My best cheers,

Lam