How can I load a Cp airfoil specific distribution to a mesh

User: "Piercarlo Marchegiani"
Piercarlo Marchegiani
Altair Community Member
Updated by Piercarlo Marchegiani

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. 

imageimage

I will attach the model also 

image
PS: I dont know why I cant load any images.

 

Hope you understood and thank you for your time.

 

cargas reales.hm
Op point export.xlsx

Find more posts tagged with

Academic
English
Sort by:
1 - 7 of 71
    User: "Adriano Koga_20259"
    Adriano Koga_20259
    New Altair Community Member
    Updated by Adriano Koga_20259

    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.

    User: "Piercarlo Marchegiani"
    Piercarlo Marchegiani
    Altair Community Member
    OP
    Updated by Piercarlo Marchegiani

    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? 

     

     

    User: "Piercarlo Marchegiani"
    Piercarlo Marchegiani
    Altair Community Member
    OP
    Updated by Piercarlo Marchegiani

    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 

     

    User: "Piercarlo Marchegiani"
    Piercarlo Marchegiani
    Altair Community Member
    OP
    Updated by Piercarlo Marchegiani

    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

    User: "Adriano Koga_20259"
    Adriano Koga_20259
    New Altair Community Member
    Updated by Adriano Koga_20259

    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.

    image

    User: "Adriano Koga_20259"
    Adriano Koga_20259
    New Altair Community Member
    Updated by Adriano Koga_20259

    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.

    User: "tinh"
    tinh
    Altair Community Member
    Updated by tinh

    Hi @Piercarlo Marchegiani 

    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.

Quick Links