2D-Simulation of airfoil

safe.payi · March 21, 2014, 17:01

Hello everyone,

I am completly new to CFD and currently working on a project where I have to do a simulation of an 2D-Airfoil.

The following data is given:

Fluid: water
Fluid velocity: 4.5 m/s
Stationary and incompressible flow
Static Pressure: 3 bar

So for structered mesh, you have to consider the diffrent types of farfields, which effect the quality of mesh, but since Simulation CFD only supports unstructered mesh, I have chosen a simple rectangle as my farfield, with two more fields for denser mesh.

Since I am a novice in this field, I would like to ask you some Questions.

1) My first question is about the boundary conditions: I have set the right edge (inlet) to "velocity" (fluidspeed 4.5 m/s) and the outlet to "pressure" (3 bar gage). The other two edges are set to slip/symmetry. Are these BCs chosen correctly?

2) I am amazed but at the same time sceptical about the mesh generation. It seems really easy to generate a unstructured mesh but at the same time I can't estimate its quality. Seeing the results, my generated mesh seems to do a good job. Could one of you take a look at my mesh and results? So far, I have mostly seen hexa-meshs for 2D-simulations, but can a tetra-mesh be that accurat too?

3) How can I make a cp-plot (pressure coefficient along both surfaces (pressure and suction side)). I have an excel-file with points of interest for measuring. Is there a possibilty to import these points?

4) My last question for now: Autodesk Simulation CFD chooses the Standard k-ε turbulence model by default. I don't know where I can change this but is this model suitable for my task?

I know these are quite some questions, but I would really appreciate it if you guys could help me here.

Many Thanks and Best Regards
safe.payi

PS: Here is the result file

surry99 · April 27, 2014, 15:50

Hello,
Have you moved or deleted you result file?
Regards

ApoloV · June 9, 2014, 10:28

This has been covered decently in the SimCFD forums on the Autodesk page.
There was another person that went through a lot of this on a 2D airfoil where I believe the only difference was that theirs was in Air not water.

As far as Turbulence models this is changed under the Solve dialog / Physics / Turbulence button.

And discussed in the online Help

March 21, 2014, 17:01	2D-Simulation of airfoil	#1
safe.payi New Member Join Date: Jan 2014 Posts: 2 Rep Power: 0	Hello everyone, I am completly new to CFD and currently working on a project where I have to do a simulation of an 2D-Airfoil. The following data is given: Fluid: water Fluid velocity: 4.5 m/s Stationary and incompressible flow Static Pressure: 3 bar So for structered mesh, you have to consider the diffrent types of farfields, which effect the quality of mesh, but since Simulation CFD only supports unstructered mesh, I have chosen a simple rectangle as my farfield, with two more fields for denser mesh. Since I am a novice in this field, I would like to ask you some Questions. 1) My first question is about the boundary conditions: I have set the right edge (inlet) to "velocity" (fluidspeed 4.5 m/s) and the outlet to "pressure" (3 bar gage). The other two edges are set to slip/symmetry. Are these BCs chosen correctly? 2) I am amazed but at the same time sceptical about the mesh generation. It seems really easy to generate a unstructured mesh but at the same time I can't estimate its quality. Seeing the results, my generated mesh seems to do a good job. Could one of you take a look at my mesh and results? So far, I have mostly seen hexa-meshs for 2D-simulations, but can a tetra-mesh be that accurat too? 3) How can I make a cp-plot (pressure coefficient along both surfaces (pressure and suction side)). I have an excel-file with points of interest for measuring. Is there a possibilty to import these points? 4) My last question for now: Autodesk Simulation CFD chooses the Standard k-ε turbulence model by default. I don't know where I can change this but is this model suitable for my task? I know these are quite some questions, but I would really appreciate it if you guys could help me here. Many Thanks and Best Regards safe.payi PS: Here is the result file

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April 27, 2014, 15:50		#2
surry99 New Member Join Date: Apr 2014 Posts: 1 Rep Power: 0	Hello, Have you moved or deleted you result file? Regards

June 9, 2014, 10:28		#3
ApoloV New Member Apolo Join Date: Jul 2009 Posts: 17 Rep Power: 16	This has been covered decently in the SimCFD forums on the Autodesk page. There was another person that went through a lot of this on a 2D airfoil where I believe the only difference was that theirs was in Air not water. As far as Turbulence models this is changed under the Solve dialog / Physics / Turbulence button. And discussed in the online Help