Fluent_Error:pressure-far-field boundary conditions can only be used with ideal gases

unknown · April 23, 2009, 04:50

It is the study of NACA0012.

Data:
Polytropic Ideal Gas
Gamma=1.4
Poo=85419 Pa
Too=260 K
Moo=0.75
alpha=0.4

Boundary conditions:
- Naca0012: WALL
- Farfield around Naca0012 (a circle enclosing naca): PRESSURE-FAR-FIELD
Gauge pressure (pascal): 85419 (Pa)
Mach number: 0.75
X-Component of flow direction: 0.997564
Y-Component of flow direction: 0.069756

....When I iterate the following error appears:
Error: pressure-far-field boundary conditions can only be used with ideal gases.
Error Object: ()

------------------

Does anyone know the reason?.

Thanks for your time!.

doki · April 23, 2009, 11:00

that means you should set the air density type as "Ideal Gas" in the material properties panel before setting the BC and iterating.
one other thing, how could you set the Mach number for the incompressible fluid?

mohanad07 · November 24, 2011, 13:43

I have problem when I use pressure far field there is divergence occurs quickly on residual solution panel, what Ido?

April 23, 2009, 04:50	Fluent_Error:pressure-far-field boundary conditions can only be used with ideal gases	#1
unknown New Member unknown Join Date: Apr 2009 Posts: 5 Rep Power: 17	It is the study of NACA0012. Data: Polytropic Ideal Gas Gamma=1.4 Poo=85419 Pa Too=260 K Moo=0.75 alpha=0.4 Boundary conditions: - Naca0012: WALL - Farfield around Naca0012 (a circle enclosing naca): PRESSURE-FAR-FIELD Gauge pressure (pascal): 85419 (Pa) Mach number: 0.75 X-Component of flow direction: 0.997564 Y-Component of flow direction: 0.069756 ....When I iterate the following error appears: Error: pressure-far-field boundary conditions can only be used with ideal gases. Error Object: () ------------------ Does anyone know the reason?. Thanks for your time!.

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April 23, 2009, 11:00		#2
doki Member Join Date: Apr 2009 Posts: 41 Rep Power: 17	that means you should set the air density type as "Ideal Gas" in the material properties panel before setting the BC and iterating. one other thing, how could you set the Mach number for the incompressible fluid?

November 24, 2011, 13:43		#3
mohanad07 New Member mohanad hussien Join Date: Nov 2011 Posts: 2 Rep Power: 0	I have problem when I use pressure far field there is divergence occurs quickly on residual solution panel, what Ido?