Could it be possible to do LES on a prototype geometry

liu · March 2, 2006, 14:48

I have a tank with dimensions of 20m long, 5m wide and 3m deep.
Is it possible to do a LES simulation on it? I know it would be extremely expensive and will take a very very long time. I have access to supercomputer resource. But still I have no idea wether this would be crazy.

I know many of you have experience on LES. Any information will be good.

eugene · March 2, 2006, 15:01

Whats in the tank?

pierre · March 2, 2006, 15:12

What's the Reynolds number?

liu · March 2, 2006, 15:12

For test, only water is considered. If it's feasible, some particles will be added into it.

I am interested in the density current.

liu · March 2, 2006, 15:18

Considering the dimensions, Reynolds number should be very big.
The inlet velocity is in the order of 0.02m/s. So Re=0.02*20/1E-6=4E+5.

eugene · March 2, 2006, 17:50

I doubt very much your largest length scale will be 20m in a 20x5x3 tank. Even so, I have done LES (DES actually) of a complete automobiles at 140km/h with OpenFOAM. Thats a Re of ~40*5/1.4e-5 = 14e6.

So go ahead, I don't think you will need a supercomputer though.

liu · March 2, 2006, 21:08

That's a good news.
I will go ahead to give it a try.

March 2, 2006, 14:48	I have a tank with dimensions	#1
liu Senior Member Xiaofeng Liu Join Date: Mar 2009 Location: State College, PA, USA Posts: 118 Rep Power: 17	I have a tank with dimensions of 20m long, 5m wide and 3m deep. Is it possible to do a LES simulation on it? I know it would be extremely expensive and will take a very very long time. I have access to supercomputer resource. But still I have no idea wether this would be crazy. I know many of you have experience on LES. Any information will be good. __________________ Xiaofeng Liu, Ph.D., P.E., Assistant Professor Department of Civil and Environmental Engineering Penn State University 223B Sackett Building University Park, PA 16802 Web: http://water.engr.psu.edu/liu/

March 2, 2006, 15:01	Whats in the tank?	#2
eugene Senior Member Eugene de Villiers Join Date: Mar 2009 Posts: 725 Rep Power: 21	Whats in the tank?

March 2, 2006, 15:12	What's the Reynolds number?	#3
pierre Member Pierre Le Fur Join Date: Mar 2009 Location: UK Posts: 60 Rep Power: 17	What's the Reynolds number?

March 2, 2006, 15:12	For test, only water is consid	#4
liu Senior Member Xiaofeng Liu Join Date: Mar 2009 Location: State College, PA, USA Posts: 118 Rep Power: 17	For test, only water is considered. If it's feasible, some particles will be added into it. I am interested in the density current. __________________ Xiaofeng Liu, Ph.D., P.E., Assistant Professor Department of Civil and Environmental Engineering Penn State University 223B Sackett Building University Park, PA 16802 Web: http://water.engr.psu.edu/liu/

March 2, 2006, 15:18	Considering the dimensions, Re	#5
liu Senior Member Xiaofeng Liu Join Date: Mar 2009 Location: State College, PA, USA Posts: 118 Rep Power: 17	Considering the dimensions, Reynolds number should be very big. The inlet velocity is in the order of 0.02m/s. So Re=0.02*20/1E-6=4E+5. __________________ Xiaofeng Liu, Ph.D., P.E., Assistant Professor Department of Civil and Environmental Engineering Penn State University 223B Sackett Building University Park, PA 16802 Web: http://water.engr.psu.edu/liu/

March 2, 2006, 17:50	I doubt very much your largest	#6
eugene Senior Member Eugene de Villiers Join Date: Mar 2009 Posts: 725 Rep Power: 21	I doubt very much your largest length scale will be 20m in a 20x5x3 tank. Even so, I have done LES (DES actually) of a complete automobiles at 140km/h with OpenFOAM. Thats a Re of ~40*5/1.4e-5 = 14e6. So go ahead, I don't think you will need a supercomputer though.

March 2, 2006, 21:08	That's a good news. I will g	#7
liu Senior Member Xiaofeng Liu Join Date: Mar 2009 Location: State College, PA, USA Posts: 118 Rep Power: 17	That's a good news. I will go ahead to give it a try. __________________ Xiaofeng Liu, Ph.D., P.E., Assistant Professor Department of Civil and Environmental Engineering Penn State University 223B Sackett Building University Park, PA 16802 Web: http://water.engr.psu.edu/liu/

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