cm vs alpha graph of an airplane on ansys fluent

titanan · August 28, 2023, 05:50

Hey everyone.
I have to find the cm (pitching moment coefficent) vs alpha graph of an airplane using ansys fluent. What is the aproach ı have to take to solve this problem.
Thanks already.

agd · August 28, 2023, 14:27

1. Build a grid of said aircraft
2. Set the angle of attacjk along with boundary conditions, freestream parameters and whatever else your flow solver needs.
3. Run the flow solver to generate a solution and compute the moment coefficient using the flow solution.
4. Plot the coefficient against that value of AOA.
5. Repeat steps 2-4 until you have generated a desired curve.

Now if you are looking for fluent specific knowledge, you might want to try the fluent specific forum.

titanan · August 29, 2023, 05:23

Hey
I see. I thought there woulld be a faster way than making a new mesh every time but that can work too.
Thanks for your suggestion.

siw · August 29, 2023, 10:25

You do not have to make a new mesh for each AoA. Just make a suitable mesh and change the freestream velocity components for each simulation.

In Fluent there is the far-field boundary condition for this type of simulation. It's efficient to make a spherical (full-aircraft) or hemispherical (half-aircraft due to symmetry) computational domain.

August 28, 2023, 05:50	cm vs alpha graph of an airplane on ansys fluent	#1
titanan New Member Join Date: Jul 2023 Posts: 12 Rep Power: 3	Hey everyone. I have to find the cm (pitching moment coefficent) vs alpha graph of an airplane using ansys fluent. What is the aproach ı have to take to solve this problem. Thanks already.

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August 28, 2023, 14:27		#2
agd Senior Member Join Date: Jul 2009 Posts: 358 Rep Power: 19	1. Build a grid of said aircraft 2. Set the angle of attacjk along with boundary conditions, freestream parameters and whatever else your flow solver needs. 3. Run the flow solver to generate a solution and compute the moment coefficient using the flow solution. 4. Plot the coefficient against that value of AOA. 5. Repeat steps 2-4 until you have generated a desired curve. Now if you are looking for fluent specific knowledge, you might want to try the fluent specific forum.

August 29, 2023, 05:23		#3
titanan New Member Join Date: Jul 2023 Posts: 12 Rep Power: 3	Hey I see. I thought there woulld be a faster way than making a new mesh every time but that can work too. Thanks for your suggestion.

August 29, 2023, 10:25		#4
siw Senior Member Stuart Join Date: Jul 2009 Location: Portsmouth, England Posts: 742 Rep Power: 26	You do not have to make a new mesh for each AoA. Just make a suitable mesh and change the freestream velocity components for each simulation. In Fluent there is the far-field boundary condition for this type of simulation. It's efficient to make a spherical (full-aircraft) or hemispherical (half-aircraft due to symmetry) computational domain.