Material Table Generation

oliveira1820 · June 19, 2018, 14:53

I have defined a material with table generation and I´m sure the pressure and temperature minimum and maximum values are accurate.

However in some iterations and some points the values of pressure or temperature are out of bounds, just for a little amount of time.

Is it better to let the solver do clipping or should I activate pressure and temperature extrapolation? What is the difference between these too?

ghorrocks · June 19, 2018, 18:38

If it clips early on but as it converges it goes back inside your limits then I would not worry about it, it should be fine.

oliveira1820 · June 19, 2018, 21:00

I will change some variables in my simulation in order to study the influence they have on results, if then the clipping is continous should I opt the extrapolation?

ghorrocks · June 20, 2018, 02:17

If the final result clips then you can extrapolate, but a better approach would be to extend your table to cover the range your simulation is covering.

June 19, 2018, 14:53	Material Table Generation	#1
oliveira1820 Senior Member Pedro Oliveira Join Date: Feb 2018 Location: Portugal Posts: 109 Rep Power: 8	I have defined a material with table generation and I´m sure the pressure and temperature minimum and maximum values are accurate. However in some iterations and some points the values of pressure or temperature are out of bounds, just for a little amount of time. Is it better to let the solver do clipping or should I activate pressure and temperature extrapolation? What is the difference between these too?

June 19, 2018, 18:38		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,705 Rep Power: 143	If it clips early on but as it converges it goes back inside your limits then I would not worry about it, it should be fine. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

June 20, 2018, 02:17		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,705 Rep Power: 143	If the final result clips then you can extrapolate, but a better approach would be to extend your table to cover the range your simulation is covering. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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June 19, 2018, 21:00		#3
oliveira1820 Senior Member Pedro Oliveira Join Date: Feb 2018 Location: Portugal Posts: 109 Rep Power: 8	I will change some variables in my simulation in order to study the influence they have on results, if then the clipping is continous should I opt the extrapolation?