how to run transisent flow in acusolve 2013?

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

hi Im using acusolve 2013 , i want  to know what turbulence model should i use for the transient flow

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Answers

  • acupro
    acupro
    Altair Employee
    edited February 2018

    The turbulence models all work for either steady or transient flows.  You'll need to determine which model to use for your particular application, but it will not depend on whether it's steady or transient.  (However, DES/LES would apply only to transient flows.)

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018

    Thank You, As I'm new to CFD . I'm not that much familiar with choosing turbulence model, can I get any notes regarding choosing the best suitable turbulence model for different applications?

  • acupro
    acupro
    Altair Employee
    edited March 2018

    I would typically start with Spalart Allmaras.  It's pretty good with most flow conditions.  Also - you may want to upgrade to the latest software version.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2018

    Ok . Now i'm going to try with 2017 version  .  i have 2 questions  mentioned it below.

     

     had a doubt , is their anything i have to look into while running transient flow analysis?

    and also do i need to change the steady flow to transient?

  • ydigit
    ydigit
    Altair Employee
    edited March 2018

    While running transient flow, check the nodal outputs and set them to a reasonable frequency (Default is 1000). I typically use 10 or 100 depending upon the case.

     

    Also change the the initial time increment in Auto Solution Strategy to 0.1 sec or whatever might be suitable for your case.

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