Nozzle Simulation temperature Extrapolation Error

xuexingyu24 · July 14, 2018, 07:41

Hello Folks

For any who performs nozzle VOF simulation, I would like to ask if you have seen the temperature extrapolation error with high injection pressure ? I have encounters a lot of temperature errors if injection pressure is above 200bar with mini 16 um grid size. The simulation works well with low pressure though. Anybody has experience on how to resolve this issue ? Does hidden/in work then ?

0364 WARNING: it = 1, WARNING ... extrapolating on the temperature calculation

get_temp_from_sensible_sie problem found in rank 0 at cell 21500, located at <-0.000792, 0.000584, -7.5e-06>, in region 2, whose level=9, ii=206, jj=292, kk=141[/I]

xieshengbai · July 17, 2018, 13:05

Hi,

Most likely the warning was due to insufficient grid resolution where high velocity or temperature occurs. For a high pressure nozzle, you may need a finer mesh to better resolve the spray. Please double check the mesh control.

July 14, 2018, 07:41	Nozzle Simulation temperature Extrapolation Error	#1
xuexingyu24 New Member Join Date: May 2017 Posts: 1 Rep Power: 0	Hello Folks For any who performs nozzle VOF simulation, I would like to ask if you have seen the temperature extrapolation error with high injection pressure ? I have encounters a lot of temperature errors if injection pressure is above 200bar with mini 16 um grid size. The simulation works well with low pressure though. Anybody has experience on how to resolve this issue ? Does hidden/in work then ? 0364 WARNING: it = 1, WARNING ... extrapolating on the temperature calculation get_temp_from_sensible_sie problem found in rank 0 at cell 21500, located at <-0.000792, 0.000584, -7.5e-06>, in region 2, whose level=9, ii=206, jj=292, kk=141[/I]

July 17, 2018, 13:05		#2
xieshengbai Member Shengbai Xie Join Date: Aug 2016 Location: Convergent Science, Madison WI Posts: 68 Rep Power: 10	Hi, Most likely the warning was due to insufficient grid resolution where high velocity or temperature occurs. For a high pressure nozzle, you may need a finer mesh to better resolve the spray. Please double check the mesh control. __________________ Shengbai Xie, Ph.D. Senior research engineer, Application (608) 230-1563 convergecfd.com

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