Problem diverging at different time instants when using hy2Foam with different procs

quarkz · January 10, 2019, 03:40

Hi,

I am trying to solve a hypersonic flow past a flat plate problem using hy2Foam, a variant of OpenFOAM meant for hypersonic flow.

I'm using the 11 species model and I realise that when I run with 4 and 8 procs, it diverges at around 1e-4 and 5.2e-5 respectively.

May I know why this is so? Is this due to the linear solver?

How should I troubleshoot?

I'm trying to run with 2 procs and see how it goes...

quarkz · January 14, 2019, 23:38

Hi, I managed to solve the problem myself by using a different linear solver. Changing from PBiCG to PBiCGStab when solving the Yi variables did the trick!

January 10, 2019, 03:40	Problem diverging at different time instants when using hy2Foam with different procs	#1
quarkz Senior Member TWB Join Date: Mar 2009 Posts: 414 Rep Power: 19	Hi, I am trying to solve a hypersonic flow past a flat plate problem using hy2Foam, a variant of OpenFOAM meant for hypersonic flow. I'm using the 11 species model and I realise that when I run with 4 and 8 procs, it diverges at around 1e-4 and 5.2e-5 respectively. May I know why this is so? Is this due to the linear solver? How should I troubleshoot? I'm trying to run with 2 procs and see how it goes...

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
pimpleDyMFoam computation randomly stops	babapeti	OpenFOAM Running, Solving & CFD	5	January 24, 2018 06:28
How to export time series of variables for one point?	mary mor	OpenFOAM Post-Processing	8	July 19, 2017 11:54
High Courant Number @ icoFoam	Artex85	OpenFOAM Running, Solving & CFD	11	February 16, 2017 14:40
Moving mesh	Niklas Wikstrom (Wikstrom)	OpenFOAM Running, Solving & CFD	122	June 15, 2014 07:20
Low Mixing time Problem	Mavier	CFX	5	April 29, 2013 01:00

January 14, 2019, 23:38		#2
quarkz Senior Member TWB Join Date: Mar 2009 Posts: 414 Rep Power: 19	Hi, I managed to solve the problem myself by using a different linear solver. Changing from PBiCG to PBiCGStab when solving the Yi variables did the trick!