Variable Pressure in Optistruct

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

How to apply varriable pressure in optistuct?

I have to apply variable pressure from 0.55Mpa to 0.055Mpa of pressure on tube varring along the circumference of tube.

 

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Answers

  • Q.Nguyen-Dai
    Q.Nguyen-Dai Altair Community Member
    edited May 2017

    Maybe try PLOAD4 card?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2017
    Altair Forum User said:

    Maybe try PLOAD4 card?

    I have tried by it but i have to apply variable pressure not uniform. I know how to apply uniform pressure but I am facing problem with applying variable pressure.

  • Q.Nguyen-Dai
    Q.Nguyen-Dai Altair Community Member
    edited May 2017

    You can use method 'equation' or 'linear interpolation'.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2017
    Altair Forum User said:

    You can use method 'equation' or 'linear interpolation'.

    Yes, You are correct but what equation I have to put for variable pressure acting from 0.55Mpa to 0.055Mpa on tube changing magnitude along the circumference of tube. I dont know how to form the equation or how to use linear interpolation method. Can u give an example of it, please.

    Thanks for the reply Nguyen-Dai .   155

  • Q.Nguyen-Dai
    Q.Nguyen-Dai Altair Community Member
    edited May 2017

    Define a local cylindrical system for your tube. Presuming that your pressure varies from 0.055 MPa to 0.55 MPa over 180° along circumference, your equation is something like:

     

    p = 0.055 + 0.495 * y / 3.14159

    ( y = 0.0 .. 3.14159 rad , y is circumferential direction)

     

    You enter only right side of this equation into Analysis => Pressure => equation. Don't forget to select your local cylindrical system thanks to the button 'system'.

    Load type = PLOAD4

     

     

     

     

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