Setting Time Step of LES

daeung44 · January 30, 2013, 10:45

Hi, I'm a graduate student of Architecture so, my background is not mechanical eng. Due to this, I can do STAR CCM+ as a routine for building application. However,I'm trying to use LES but I can't figure out how I can setup maximum physical step in STAR CCM+.

My work is to simulate wind tunnel with just cubic model. Is there anyone to tell me setup general physical time and inner iterations?

Danny

siara817 · January 30, 2013, 12:31

Do you know how long does it take to air flow enter and then leave the domain?

daeung44 · January 30, 2013, 12:38

I assume that 100mph blows. So, it might take 1~2sec. But I'm not sure. Do I have to calculate the physical time?

The air enters to X direction and its speed is just 44.7m/s. The domain size is 180m*340m*66m(h). The number of mesh is about 300,000.

Danny

daeung44 · January 30, 2013, 12:42

Quote:

Originally Posted by siara817

Do you know how long does it take to air flow enter and then leave the domain?

I assume that 100mph blows. So, it might take 1~2sec. But I'm not sure. Do I have to calculate the physical time?

The air enters to X direction and its speed is just 44.7m/s. The domain size is 180m*340m*66m(h). The number of mesh is about 300,000.

Danny

siara817 · February 1, 2013, 06:27

Dear Kim,

I think if you consider 0.01 second, it would be fine. However check the courant number for your solution. See what is the courant number range.

January 30, 2013, 10:45	Setting Time Step of LES	#1
daeung44 New Member Daeung Kim Join Date: Jan 2013 Posts: 3 Rep Power: 13	Hi, I'm a graduate student of Architecture so, my background is not mechanical eng. Due to this, I can do STAR CCM+ as a routine for building application. However,I'm trying to use LES but I can't figure out how I can setup maximum physical step in STAR CCM+. My work is to simulate wind tunnel with just cubic model. Is there anyone to tell me setup general physical time and inner iterations? Danny

January 30, 2013, 12:31		#2
siara817 Senior Member siamak rahimi ardkapan Join Date: Jul 2010 Location: Copenhagen, Denmark Posts: 220 Rep Power: 18	Do you know how long does it take to air flow enter and then leave the domain? __________________ Good luck Siamak

January 30, 2013, 12:38		#3
daeung44 New Member Daeung Kim Join Date: Jan 2013 Posts: 3 Rep Power: 13	I assume that 100mph blows. So, it might take 1~2sec. But I'm not sure. Do I have to calculate the physical time? The air enters to X direction and its speed is just 44.7m/s. The domain size is 180m340m66m(h). The number of mesh is about 300,000. Danny Last edited by daeung44; January 31, 2013 at 13:41. Reason: duplication

February 1, 2013, 06:27		#5
siara817 Senior Member siamak rahimi ardkapan Join Date: Jul 2010 Location: Copenhagen, Denmark Posts: 220 Rep Power: 18	Dear Kim, I think if you consider 0.01 second, it would be fine. However check the courant number for your solution. See what is the courant number range. __________________ Good luck Siamak

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