DNS solver confusion

jiejie · December 13, 2011, 00:22

Dear fomers

I have been using pisoFoam for high Reynolds number flow over a cylinder simulations. At the moment, I am trying to run some low Reynolds number cases with a DNS solver. The dnsFoam is for box turbulence case with extra forcing term in it. However, I lloked at the icoFoam source file and it seems quite similar to the dnsFoam without the forcing. Does this mean icoFoam is a DNS solver or I am completely wrong?

Thanks

stevenvanharen · December 13, 2011, 06:14

icoFoam is a solver without any modelling for turbulence.

So it can be used for a laminar flow, or for a DNS. However, it will of course only be a DNS if your mesh will allow this etc. etc.

jiejie · December 13, 2011, 19:37

Quote:

Originally Posted by stevenvanharen

However, it will of course only be a DNS if your mesh will allow this etc. etc.

Hi stevenvanharen, Thanks for the speedy reply. Regarding to the mesh, you are saying it will only be a DNS is the mesh is designed for a DNS simulation?

Thanks

stevenvanharen · December 14, 2011, 09:46

yes, that is what I am saying

ooo · February 3, 2014, 16:57

should we except exactly same result if we solve a laminar case by icoFoam and dnsFoam?
Because there is an extra source term in dnsFoam...

December 13, 2011, 00:22	DNS solver confusion	#1
jiejie Senior Member Jie Join Date: Jan 2010 Location: Australia Posts: 134 Rep Power: 16	Dear fomers I have been using pisoFoam for high Reynolds number flow over a cylinder simulations. At the moment, I am trying to run some low Reynolds number cases with a DNS solver. The dnsFoam is for box turbulence case with extra forcing term in it. However, I lloked at the icoFoam source file and it seems quite similar to the dnsFoam without the forcing. Does this mean icoFoam is a DNS solver or I am completely wrong? Thanks

December 13, 2011, 06:14		#2
stevenvanharen Senior Member Steven van Haren Join Date: Aug 2010 Location: The Netherlands Posts: 149 Rep Power: 16	icoFoam is a solver without any modelling for turbulence. So it can be used for a laminar flow, or for a DNS. However, it will of course only be a DNS if your mesh will allow this etc. etc. mgg, Mehrez and Hughtong like this.

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December 14, 2011, 09:46		#4
stevenvanharen Senior Member Steven van Haren Join Date: Aug 2010 Location: The Netherlands Posts: 149 Rep Power: 16	yes, that is what I am saying

February 3, 2014, 16:57		#5
ooo Member Join Date: Feb 2012 Posts: 49 Rep Power: 14	should we except exactly same result if we solve a laminar case by icoFoam and dnsFoam? Because there is an extra source term in dnsFoam...