Spray-A AMR

sangeeth · May 13, 2018, 08:38

Hi all

I am new to converge and AMR. Can someone suggest me a good value for sub-grid criterion for AMR>velocity. I ran SprayA LES simulation with 1 m/s but the AMR is not resolving as much as I want, causing huge error in the vapor penetration calculation.

xieshengbai · May 14, 2018, 17:34

Hi,

For a SprayA RANS modeling, we have some good experience on 1 for velocity, 2.5 for temp, and .001 for void fraction (for a VOF case). The base grid size is 0.2 mm. For LES, I think it wouldn't differ too much. If 1 doesn't work for you, try 0.5 or 0.25 if the cell count and memory are allowed. Thanks.

May 13, 2018, 08:38	Spray-A AMR	#1
sangeeth New Member Sangeeth Sanal Join Date: Jul 2015 Posts: 3 Rep Power: 10	Hi all I am new to converge and AMR. Can someone suggest me a good value for sub-grid criterion for AMR>velocity. I ran SprayA LES simulation with 1 m/s but the AMR is not resolving as much as I want, causing huge error in the vapor penetration calculation.

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May 14, 2018, 17:34		#2
xieshengbai Member Shengbai Xie Join Date: Aug 2016 Location: Convergent Science, Madison WI Posts: 60 Rep Power: 9	Hi, For a SprayA RANS modeling, we have some good experience on 1 for velocity, 2.5 for temp, and .001 for void fraction (for a VOF case). The base grid size is 0.2 mm. For LES, I think it wouldn't differ too much. If 1 doesn't work for you, try 0.5 or 0.25 if the cell count and memory are allowed. Thanks.