Pressure control during simulation

tmy · June 4, 2018, 16:01

Hi all,

I have some questions about what CONVERGE can do for pressure control. I know that for engine simulation condition, pressure and temperature will be calculated starting from initial conditions, thus it's not controlled by us.

Now I have a case in a fixed controlled volume, and I want to input the pressure trace with respect to time change. Is it possible in CONVERGE? I appreciate if someone could help me with this!

chaighodke · June 4, 2018, 17:36

Hi -

Do you want to specify pressure as a function of time? This can be done by using temporal type input file. Please let me know if that is what you want to do.

tmy · June 4, 2018, 17:51

Hi chaighodke,

Yes! I want to specify pressure as a function of time. I find some ways to change the pressure but not sure it that's correct?

I set one of my boundary as outflow, and input the pressure as a function of time to this boundary? Please let me know if there are any other correct methods I should use, thanks for your help!

By the way is it possible to input temperature as a function of time? Is it similar to the way that pressure is input as a function of time?

tmy · June 5, 2018, 16:58

Hi chaighodke,

Is it possible to use temporal type input file when all my boundaries are set as wall boundary condition?

Best

Quote:

Originally Posted by chaighodke

Hi -

Do you want to specify pressure as a function of time? This can be done by using temporal type input file. Please let me know if that is what you want to do.

chaighodke · June 5, 2018, 18:15

Hi -

You can specify pressure or velocity as a function of time. To do this, open the boundary panel, then click on the desired boundary, and check "use file" option. A new panel will open where you can specify the type of the file as sequential or cyclic. Here you can specify value of the variable as a function of time. Hope this helps.

MFGT · June 6, 2018, 03:06

If you have a closed volume without INFLOW our OUTFLOW boundaries, try source/sink modeling-> select energy source with source unit "pressure", load the profile and select shape type "region"

tmy · June 6, 2018, 10:09

It's working now! Thanks a lot.

Quote:

Originally Posted by MFGT

If you have a closed volume without INFLOW our OUTFLOW boundaries, try source/sink modeling-> select energy source with source unit "pressure", load the profile and select shape type "region"

June 4, 2018, 16:01	Pressure control during simulation	#1
tmy Member Mingyuan Tao Join Date: Mar 2016 Posts: 31 Rep Power: 10	Hi all, I have some questions about what CONVERGE can do for pressure control. I know that for engine simulation condition, pressure and temperature will be calculated starting from initial conditions, thus it's not controlled by us. Now I have a case in a fixed controlled volume, and I want to input the pressure trace with respect to time change. Is it possible in CONVERGE? I appreciate if someone could help me with this!

June 4, 2018, 17:36		#2
chaighodke New Member Chaitanya Ghodke Join Date: May 2017 Location: Convergent Science, Madison WI Posts: 29 Rep Power: 8	Hi - Do you want to specify pressure as a function of time? This can be done by using temporal type input file. Please let me know if that is what you want to do. tmy likes this. __________________ --------------------------------------------- Chaitanya D. Ghodke, Ph.D. Senior Research engineer Convergent Science Inc. ---------------------------------------------

June 5, 2018, 18:15		#5
chaighodke New Member Chaitanya Ghodke Join Date: May 2017 Location: Convergent Science, Madison WI Posts: 29 Rep Power: 8	Hi - You can specify pressure or velocity as a function of time. To do this, open the boundary panel, then click on the desired boundary, and check "use file" option. A new panel will open where you can specify the type of the file as sequential or cyclic. Here you can specify value of the variable as a function of time. Hope this helps. __________________ --------------------------------------------- Chaitanya D. Ghodke, Ph.D. Senior Research engineer Convergent Science Inc. ---------------------------------------------

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June 4, 2018, 17:51		#3
tmy Member Mingyuan Tao Join Date: Mar 2016 Posts: 31 Rep Power: 10	Hi chaighodke, Yes! I want to specify pressure as a function of time. I find some ways to change the pressure but not sure it that's correct? I set one of my boundary as outflow, and input the pressure as a function of time to this boundary? Please let me know if there are any other correct methods I should use, thanks for your help! By the way is it possible to input temperature as a function of time? Is it similar to the way that pressure is input as a function of time?

June 6, 2018, 03:06		#6
MFGT Senior Member Tobias Join Date: May 2016 Location: Germany Posts: 264 Rep Power: 10	If you have a closed volume without INFLOW our OUTFLOW boundaries, try source/sink modeling-> select energy source with source unit "pressure", load the profile and select shape type "region"