Boundry conditions for O-grid mesh

saad · September 16, 2014, 15:22

Dear All,

Using pointwise, I have created hyperbolic O-grid topology 2d mesh for airfoil, now for boundry condition, what I am doing, is to split the outer circle into two semi curves (for velocity inlet and pressure outlet)

Is this right approach?? or there is other way around? kindly help
my solver is ansys fluent

Thanks

cnsidero · September 17, 2014, 09:57

That depends on the type of gas model you are using. If you are assuming a compressible flow (ideal gas), Fluent has a characteristic boundary condition call "farfield" where you set the freestream conditions. This boundary condition type would allow you to use the whole circle.

However, this boundary condition can not be used for incompressible flow (constant density). Therefore, the approach you are using would be appropriate.

BSengupta · December 30, 2018, 17:13

Hi!
What shall be BC in case of openfoam?

tcarrigan · January 3, 2019, 12:16

Quote:

Originally Posted by BSengupta

Hi!
What shall be BC in case of openfoam?

There's a "freestream" and "freestreamPressure" type you can use with OpenFOAM. You'll just need to specify a "freestreamValue" and you're good to go.

BSengupta · January 4, 2019, 03:00

Thank you very much. It was successful.

Kfj · February 9, 2020, 01:37

I used farfield as velocity inlet, airfoil as wall.. which boundary condition I give for sides?...This was the problem that I faced in ansys fluent solver.. can anyone help me?

Kfj · February 9, 2020, 01:39

I used farfield as velocity inlet, airfoil as wall for o grid mesh.. which boundary condition I give for sides?...This was the problem that I faced in ansys fluent solver.. can anyone help me?.. in ansys fluent I got big confusion what I give for sides?

Kfj · February 22, 2020, 01:12

hi!
what shall be BC incase of ansys fluent

September 16, 2014, 15:22	Boundry conditions for O-grid mesh	#1
saad New Member saad Join Date: Apr 2014 Posts: 1 Rep Power: 0	Dear All, Using pointwise, I have created hyperbolic O-grid topology 2d mesh for airfoil, now for boundry condition, what I am doing, is to split the outer circle into two semi curves (for velocity inlet and pressure outlet) Is this right approach?? or there is other way around? kindly help my solver is ansys fluent Thanks

February 9, 2020, 01:37	O grid mesh boundary condition in ansys fluent solver	#6
Kfj New Member Jay Join Date: Feb 2020 Posts: 3 Rep Power: 6	I used farfield as velocity inlet, airfoil as wall.. which boundary condition I give for sides?...This was the problem that I faced in ansys fluent solver.. can anyone help me?

February 9, 2020, 01:39	O grid mesh boundary condition in ansys fluent solver	#7
Kfj New Member Jay Join Date: Feb 2020 Posts: 3 Rep Power: 6	I used farfield as velocity inlet, airfoil as wall for o grid mesh.. which boundary condition I give for sides?...This was the problem that I faced in ansys fluent solver.. can anyone help me?.. in ansys fluent I got big confusion what I give for sides?

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September 17, 2014, 09:57		#2
cnsidero Senior Member Chris Sideroff Join Date: Mar 2009 Location: Ottawa, ON, CAN Posts: 434 Rep Power: 22	That depends on the type of gas model you are using. If you are assuming a compressible flow (ideal gas), Fluent has a characteristic boundary condition call "farfield" where you set the freestream conditions. This boundary condition type would allow you to use the whole circle. However, this boundary condition can not be used for incompressible flow (constant density). Therefore, the approach you are using would be appropriate.

December 30, 2018, 17:13		#3
BSengupta Member Bidesh Sengupta Join Date: Sep 2018 Location: Sngapore Posts: 76 Rep Power: 7	Hi! What shall be BC in case of openfoam?

January 4, 2019, 03:00		#5
BSengupta Member Bidesh Sengupta Join Date: Sep 2018 Location: Sngapore Posts: 76 Rep Power: 7	Thank you very much. It was successful.

February 22, 2020, 01:12		#8
Kfj New Member Jay Join Date: Feb 2020 Posts: 3 Rep Power: 6	hi! what shall be BC incase of ansys fluent