OF Compressible equations SIMPLE/PISO

alberto · May 18, 2010, 15:23

Quote:

Originally Posted by truong_nm

How many sub-iterations (nOuterCorrectors) do you recommend to me ?

Hard to say given that the only know I think are the solver you're using and the type of the BC's

I can only say you need a number that makes your solution converge.

Best,

truong_nm · May 19, 2010, 15:16

I made some investigations and I think that I will keep rhoPisoFoam + SLTS. This duo gives me the best convergence/accuracy/speed.

nileshjrane · September 2, 2010, 13:56

Hello truong_nm,

i am quite new to OF so dont know much about it. Can you please tell me how to make this "rhoPisoFoam + SLTS" thing work?? how to set it up?? What needs to be modified??

Thank you,

gashishr · August 15, 2011, 15:25

Ngoc-Minh Truong: It seems you have good experience in OpenFoam. I am very new to it. I want to solve steady state airoil problem for Mach 0.3 to 0.9. I am very confused with the solver. Can you suggest me suitable solver?

alberto · August 16, 2011, 03:03

Take a look at rhoCentralFoam.

dancfd · November 29, 2011, 23:16

Entered in error, my apologies.

Dan

alberto · November 30, 2011, 01:47

@daniel: I received the notification of your comment. rhoCentralFoam has turbulence models in OF 2.0.x, while it did not have them in previous versions. :-)

Best,

giovanni10 · November 30, 2011, 12:04

Has anybody ever used cyclic boundary conditions in sonicFoam?
I have used them in mhdFoam ( a solver for magnetohydrodynamics (MHD): incompressible, laminar flow of a conducting fluid under the influence of a magnetic field.). As far as this solver concerned, everything worked well! Nevertheless, when I tried to use cyclic boundary conditions in sonicFoam I had errors!I don`t know how can I write the cyclic boundary conditions for the pressure. I have a 2-D cavity.

For example in sonicFoam/laminar/forwardstep/0/p:
outlet
{
type waveTransmissive;
field p;
phi phi;
rho rho;
psi psi;
gamma 1.4;
fieldInf 1;
lInf 3;
value uniform 1;
}

when I want to declare it as cyclic , I can write:

outlet
{
type cyclic;
}
But I have errors!

Could everybody help me?
Thanks in advance!

dancfd · December 4, 2011, 22:31

Thank you, Alberto, for clearing that up.

Regards,

Dan

September 2, 2010, 13:56		#23
nileshjrane Senior Member Nilesh Rane Join Date: Apr 2010 Posts: 122 Rep Power: 16	Hello truong_nm, i am quite new to OF so dont know much about it. Can you please tell me how to make this "rhoPisoFoam + SLTS" thing work?? how to set it up?? What needs to be modified?? Thank you, __________________ Imagination is more important than knowledge..

August 16, 2011, 03:03		#25
alberto Senior Member Alberto Passalacqua Join Date: Mar 2009 Location: Ames, Iowa, United States Posts: 1,912 Rep Power: 36	Take a look at rhoCentralFoam. __________________ Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status: http://albertopassalacqua.com/?p=1541) OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using.

November 29, 2011, 23:16		#26
dancfd Senior Member Daniel Join Date: Jul 2009 Location: Montreal, Canada Posts: 156 Rep Power: 17	Entered in error, my apologies. Dan Last edited by dancfd; November 29, 2011 at 23:32.

November 30, 2011, 01:47		#27
alberto Senior Member Alberto Passalacqua Join Date: Mar 2009 Location: Ames, Iowa, United States Posts: 1,912 Rep Power: 36	@daniel: I received the notification of your comment. rhoCentralFoam has turbulence models in OF 2.0.x, while it did not have them in previous versions. :-) Best, __________________ Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status: http://albertopassalacqua.com/?p=1541) OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using.

November 30, 2011, 12:04	cyclic boundary conditions in sonicFoam!	#28
giovanni10 New Member giovanni silva Join Date: Jul 2010 Posts: 14 Rep Power: 16	Has anybody ever used cyclic boundary conditions in sonicFoam? I have used them in mhdFoam ( a solver for magnetohydrodynamics (MHD): incompressible, laminar flow of a conducting fluid under the influence of a magnetic field.). As far as this solver concerned, everything worked well! Nevertheless, when I tried to use cyclic boundary conditions in sonicFoam I had errors!I don`t know how can I write the cyclic boundary conditions for the pressure. I have a 2-D cavity. For example in sonicFoam/laminar/forwardstep/0/p: outlet { type waveTransmissive; field p; phi phi; rho rho; psi psi; gamma 1.4; fieldInf 1; lInf 3; value uniform 1; } when I want to declare it as cyclic , I can write: outlet { type cyclic; } But I have errors! Could everybody help me? Thanks in advance!

May 19, 2010, 15:16		#22
truong_nm Member Ngoc-Minh Truong Join Date: Feb 2010 Location: Toulouse, France Posts: 42 Rep Power: 16	I made some investigations and I think that I will keep rhoPisoFoam + SLTS. This duo gives me the best convergence/accuracy/speed.

August 15, 2011, 15:25		#24
gashishr New Member Ashish Join Date: Aug 2011 Posts: 5 Rep Power: 15	Ngoc-Minh Truong: It seems you have good experience in OpenFoam. I am very new to it. I want to solve steady state airoil problem for Mach 0.3 to 0.9. I am very confused with the solver. Can you suggest me suitable solver?

December 4, 2011, 22:31		#29
dancfd Senior Member Daniel Join Date: Jul 2009 Location: Montreal, Canada Posts: 156 Rep Power: 17	Thank you, Alberto, for clearing that up. Regards, Dan

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