Page 1 of 1
SIMPLE AIR FLOW VALVE SIMULATION (need some help)
Posted: Thu Apr 27, 2017 12:18 pm
by LaurentDelaon
hi,
I am *absolutly* not an expert in CFD...
I want simulate an air flow pressure in a pipe, with a disk simulating a valve movement.
I need to move the angle disk fonction of time.
So I would calculate the pressure evolution in front of the disk function of the time.
what version of code saturn I should use with a Unbutu 14.04 or 16.04 ?
I have a K40 nvidia processor.
How I do start to realise that ?
What are the difficulties ?
Laurent.
Re: SIMPLE AIR FLOW VALVE SIMULATION (need some help)
Posted: Wed May 03, 2017 1:38 am
by Yvan Fournier
Hello,
I recommend using Code_Saturne 4.0 or 5.0-beta (5.0 will be released by the end of this month).
You will need to recompile it. You can start using the Ubuntu packages instead (this will in any case make your future installation easier by pulling dependencies), but user subroutines do not seem to work using the Ubuntu package (they work in Debian), so you will be limited to the GUI.
For small movements, you could use a deformable mesh, but this will add complexity, and not work when the mesh is too deformed or topology changes, so I recommend building a series of meshes (one for each position, so scripting them is useful).
Code_Saturne does not directly handle GPU's (except optionally through PETSc, which assumes advanced user subroutines setup), so your NVIDIA GPU is less important than you host processor type.
Regards,
Yvan
Re: SIMPLE AIR FLOW VALVE SIMULATION (need some help)
Posted: Wed May 10, 2017 3:58 pm
by LaurentDelaon
Hi Yvan,
Thank's for your advertisings.
I have a computer like this :
Xeon E5-2620 v4 @2.1GHz
16 Go ddrm4 2133Mhz.
8 cores 16 threads
my question : is the cudaBlas not take into account ?
is code saturne using Blas or Atlas ? or a Library like that ?
thank's.
Laurent.
Re: SIMPLE AIR FLOW VALVE SIMULATION (need some help)
Posted: Wed May 10, 2017 9:34 pm
by Yvan Fournier
Hello,
No, we dot not use BLAS libraries (except as an option for performance/precision comparison checks, and the Intel MKL as an option for sparse matrix-vector products), because Code_Saturne uses mostly BLAS-1 operations, for which BLAS libraries do not significantly improve performance (the arithmetic intensity being too low, these operations are bandwith-limited), but add complexity, especially when using OpenMP threads.
Best regards,
Yvan