On the far field boundary conditions.

January 10, 2005, 03:13

During the simulation, I need to use the far field boundary conditions, i.e. free boundary conditions for the incompressible ideal gas, but in the Fluent, the pressure far field boundary conditions is only for the compressible ideal gas, so, I don¡¯t know what I should do. Help, please. Thanks.

January 10, 2005, 05:01

What kind of simulation are you doing?an aircraft or car analysis?

January 10, 2005, 06:13

Far field of the jet, what should I do? thanks

January 10, 2005, 06:16

Use the pressure-outlet BC.

January 10, 2005, 08:23

How can I set the pressure value?

January 11, 2005, 13:39

you're gonna get some reverse flow. so place the pressure outlets as far as you can.

January 11, 2005, 17:11

Use Pressure Far-field and set your gas to Ideal gas regardless.

If you suspect your flow mach number is low enough to avoid compressibility effects (Ma <0.3), you should still get the same solution even though you use the ideal gas/Pressure far field.

January 11, 2005, 21:53

I see. Thank you for you help.

January 10, 2005, 03:13	On the far field boundary conditions.	#1
mini Guest Posts: n/a	During the simulation, I need to use the far field boundary conditions, i.e. free boundary conditions for the incompressible ideal gas, but in the Fluent, the pressure far field boundary conditions is only for the compressible ideal gas, so, I don¡¯t know what I should do. Help, please. Thanks.

January 10, 2005, 05:01	Re: On the far field boundary conditions.	#2
Luca Guest Posts: n/a	What kind of simulation are you doing?an aircraft or car analysis?

January 10, 2005, 06:13	Re: On the far field boundary conditions.	#3
mini Guest Posts: n/a	Far field of the jet, what should I do? thanks

January 10, 2005, 06:16	Re: On the far field boundary conditions.	#4
Luca Guest Posts: n/a	Use the pressure-outlet BC.

January 10, 2005, 08:23	Re: On the far field boundary conditions.	#5
mini Guest Posts: n/a	How can I set the pressure value?

January 11, 2005, 13:39	Re: On the far field boundary conditions.	#6
someone Guest Posts: n/a	you're gonna get some reverse flow. so place the pressure outlets as far as you can.

January 11, 2005, 17:11	Re: On the far field boundary conditions.	#7
RIaan Guest Posts: n/a	Use Pressure Far-field and set your gas to Ideal gas regardless. If you suspect your flow mach number is low enough to avoid compressibility effects (Ma <0.3), you should still get the same solution even though you use the ideal gas/Pressure far field.

January 11, 2005, 21:53	Re: On the far field boundary conditions.	#8
mini Guest Posts: n/a	I see. Thank you for you help.

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