rhoPimpleFoam

tom.opt · October 12, 2017, 12:32

Hi,
I haven't done a URANS simulation before and i need some help please.
I am looking at running rhoPimpleFoam.
I have previously ran a rhoSimpleFoam simulation and understood that the setup for rhoPimple foam would be very similar with the exception that my system directory would be different.
I am planning on copying openfoam5/tutorials/compressible/rhoPimpleFoam/RAS/cavity/system .
Is there anything that you think i need to modify apart from the deltaT in my control dict?
How do i chose an appropriate deltaT? I understood that it related to cellsize and courant number...but how do i find out my cell size?

Are there any good videos on rhoPimpleFoam?

Kind regards,
Tom

Fridrik · October 19, 2017, 13:47

Hi Tom

I just started working with rhoPimpleFoam and would like to share my limited knowledge.

When I select a deltaT, i just make a guestimate and iterate to make sure the Courant number is less than 1 (eventhough the pimple algorithm should be able to handle Co > 1). The correct way to get deltaT is to use:

$Co = \frac{u\Delta T}{\Delta x}$

for more dimension
http://https://en.wikipedia.org/wiki...Lewy_condition

maybe you can see the see a magnitude of the size of your grid in constant/polyMesh/points.

- Fridrik Magnusson

Heremus · October 20, 2017, 06:10

Hi Tom

was using pimpleFOAM once. This will help you.

https://openfoamwiki.net/index.php/O...hm_in_OpenFOAM

October 12, 2017, 12:32	rhoPimpleFoam	#1
tom.opt Member Tom Join Date: Apr 2017 Posts: 50 Rep Power: 9	Hi, I haven't done a URANS simulation before and i need some help please. I am looking at running rhoPimpleFoam. I have previously ran a rhoSimpleFoam simulation and understood that the setup for rhoPimple foam would be very similar with the exception that my system directory would be different. I am planning on copying openfoam5/tutorials/compressible/rhoPimpleFoam/RAS/cavity/system . Is there anything that you think i need to modify apart from the deltaT in my control dict? How do i chose an appropriate deltaT? I understood that it related to cellsize and courant number...but how do i find out my cell size? Are there any good videos on rhoPimpleFoam? Kind regards, Tom

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October 19, 2017, 13:47		#2
Fridrik Member Fridrik Magnusson Join Date: Aug 2017 Location: Denmark Posts: 34 Rep Power: 9	Hi Tom I just started working with rhoPimpleFoam and would like to share my limited knowledge. When I select a deltaT, i just make a guestimate and iterate to make sure the Courant number is less than 1 (eventhough the pimple algorithm should be able to handle Co > 1). The correct way to get deltaT is to use: $Co = \frac{u\Delta T}{\Delta x}$ for more dimension http://https://en.wikipedia.org/wiki...Lewy_condition maybe you can see the see a magnitude of the size of your grid in constant/polyMesh/points. - Fridrik Magnusson

October 20, 2017, 06:10		#3
Heremus New Member Join Date: Mar 2014 Posts: 9 Rep Power: 13	Hi Tom was using pimpleFOAM once. This will help you. https://openfoamwiki.net/index.php/O...hm_in_OpenFOAM