I got complete different results for pisofoam and pimplefoam?

lakeat · December 14, 2011, 18:47

I got completely different results for pisofoam and pimplefoam.

"completely" means, the resulting strouhal numbers are so different, as the former is almost twice bigger than the second.

2D and 3D are all tested, and also with a variety of turb models, etc.

All the other settings are the same.

I am very surprised.

su_junwei · December 14, 2011, 22:00

Quote:

Originally Posted by lakeat

I got completely different results for pisofoam and pimplefoam.

"completely" means, the resulting strouhal numbers are so different, as the former is almost twice bigger than the second.

2D and 3D are all tested, and also with a variety of turb models, etc.

All the other settings are the same.

I am very surprised.

It seems that pisoFoam is a totally transient, the simulation results are the resultes on time point. PimpleSimpleFoam is not a totally transient, it has a relaxation on each time step, thus, the results should be the average results over a given time step.

Junwei

lakeat · December 14, 2011, 22:09

There might be a bug in pisofoam, the one I downloaded. I am double-checking it.

hfs · November 7, 2012, 15:19

Hello!

I am interested in the comparison ... did you find out what is wrong??

michael1023 · December 26, 2012, 22:28

Quote:

Originally Posted by lakeat

I got completely different results for pisofoam and pimplefoam.

"completely" means, the resulting strouhal numbers are so different, as the former is almost twice bigger than the second.

2D and 3D are all tested, and also with a variety of turb models, etc.

All the other settings are the same.

I am very surprised.

What case did you take, flow past over a circular cylinder? Could you show the results to me?
Thank you.

Zhou Qiang

hfs · December 27, 2012, 03:26

Hello Zhou,

I got a similar problem here (cases are included):
http://www.cfd-online.com/Forums/ope...alcontrol.html

here is another report of a similar problem too:
http://www.cfd-online.com/Forums/ope...n-freezes.html

I hope that can help solve the problem..

michael1023 · December 27, 2012, 05:25

Hi, hfs

sorry, I cannot help you since I am not familiar to RAS model.

December 14, 2011, 18:47	I got complete different results for pisofoam and pimplefoam?	#1
lakeat Senior Member Daniel WEI (老魏) Join Date: Mar 2009 Location: Beijing, China Posts: 689 Blog Entries: 9 Rep Power: 21	I got completely different results for pisofoam and pimplefoam. "completely" means, the resulting strouhal numbers are so different, as the former is almost twice bigger than the second. 2D and 3D are all tested, and also with a variety of turb models, etc. All the other settings are the same. I am very surprised. __________________ ~ Daniel WEI ------------- Boeing Research & Technology - China Beijing, China Email

December 14, 2011, 22:09		#3
lakeat Senior Member Daniel WEI (老魏) Join Date: Mar 2009 Location: Beijing, China Posts: 689 Blog Entries: 9 Rep Power: 21	There might be a bug in pisofoam, the one I downloaded. I am double-checking it. __________________ ~ Daniel WEI ------------- Boeing Research & Technology - China Beijing, China Email

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Running stably with a large Courant number using pimpleFoam	mlawson	OpenFOAM	11	November 29, 2014 11:37
tried with pimpleFoam and a big CFL = 5	ivan_cozza	OpenFOAM Running, Solving & CFD	9	June 4, 2013 19:14
On the pimpleFoam solution algorithm	vkrastev	OpenFOAM Running, Solving & CFD	17	November 15, 2012 05:25
pimpleFoam convergency issue	Amir	OpenFOAM	0	July 31, 2011 12:56
Looking for a pimpleFoam tutorial using Salome (and hardware recommendations?)	madact	OpenFOAM	1	May 27, 2010 02:24

November 7, 2012, 15:19		#4
hfs Member Join Date: Jul 2012 Posts: 66 Rep Power: 14	Hello! I am interested in the comparison ... did you find out what is wrong??

December 27, 2012, 03:26		#6
hfs Member Join Date: Jul 2012 Posts: 66 Rep Power: 14	Hello Zhou, I got a similar problem here (cases are included): http://www.cfd-online.com/Forums/ope...alcontrol.html here is another report of a similar problem too: http://www.cfd-online.com/Forums/ope...n-freezes.html I hope that can help solve the problem..

December 27, 2012, 05:25		#7
michael1023 New Member Qiang Zhou Join Date: May 2010 Location: Eindhoven University of Technology Posts: 28 Rep Power: 16	Hi, hfs sorry, I cannot help you since I am not familiar to RAS model.