How can I load a Cp airfoil specific distribution to a mesh
Hi!
The problem is the following, I am looking to introduce a pressure distribution onto an airfoil.
I have the Cp values for specific points that doesn´t match my mesh nodes because they were not obtained through a CFD of the airfoil.
The problem is the same for the Cf values.
I will attach the excel with the values.
At first I thought graphing this values, dividing them into functions that I could aproxximate well with trend lines and introduce this functions into the respective nodes that I was selecting by hand. This demands a lot of time and at the end I discovered that the trend lines were not good enough unless I use 15 decimals, thing that exceeds the space to put equations by hypermesh.
I will attach the model also
PS: I dont know why I cant load any images.
Hope you understood and thank you for your time.
Answers
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I'm sorry. Could you describe what solver are you trying to use? Is it structural?
Do you need to map pressures into a structural model?
If yes, one tool that could help you is 'Fields' in HyperMesh. Take a look at its documentation in HyperMesh help section, please.
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Adriano Koga_20259 said:
I'm sorry. Could you describe what solver are you trying to use? Is it structural?
Do you need to map pressures into a structural model?
If yes, one tool that could help you is 'Fields' in HyperMesh. Take a look at its documentation in HyperMesh help section, please.
I am using Optistruct.
Yes I need to map pressures/forces into a structural model. The problem is I have the values in specific points tha doesnt match the mesh nodes, the only option I have is to put the forces one by one but it is not feasible due to the amount of points.
I red the help in fields. Do you know how I can introduce the forces through bulk data or via text files?0 -
Piercarlo Marchegiani said:
I am using Optistruct.
Yes I need to map pressures/forces into a structural model. The problem is I have the values in specific points tha doesnt match the mesh nodes, the only option I have is to put the forces one by one but it is not feasible due to the amount of points.
I red the help in fields. Do you know how I can introduce the forces through bulk data or via text files?Optistruct for linear static analysis
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I tried using linear interpolation, but I need one coordinate to be always normal to the surface and this doesnt give me this option I would need to determine the coordinates one by one
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Piercarlo Marchegiani said:
I am using Optistruct.
Yes I need to map pressures/forces into a structural model. The problem is I have the values in specific points tha doesnt match the mesh nodes, the only option I have is to put the forces one by one but it is not feasible due to the amount of points.
I red the help in fields. Do you know how I can introduce the forces through bulk data or via text files?There are examples in the documentation:
I would try mapping as pressures.
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Piercarlo Marchegiani said:
I tried using linear interpolation, but I need one coordinate to be always normal to the surface and this doesnt give me this option I would need to determine the coordinates one by one
Maybe u,v parametric mapping in Fields might help you, then. Not quite sure.
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I think trend line is not a good idea, because as we can see, it is overfitting!
You should take position X of ploads in the model to the excel sheet, and then calculate corresponding cp, cd by interpolation.
example, your excel sheet:
x cp
0 1.5
0.1 1.7
0.2 1.9
0.3 1.95
your ploads position in model: X = 0.13
=> cp = (X-0.1)/(0.2-0.1)*(1.9-1.7)+1.7 (linear)
If you can write a tcl script to do that, it will save much time.
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