Air Flow around a Car

kpk
kpk Altair Community Member
edited August 2022 in Community Q&A

I am Trying to simulate a Car moving on a Ground/Road with velocities around 50 to 100 k mph, i have attached BCs for reference

are the BCs correct to study the Air flow around Car

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Answers

  • acupro
    acupro
    Altair Employee
    edited July 2022

    That seems reasonable.  You may want to make the domain larger - so more distance from the car to the side/top boundaries.  The flow around the car won't necessarily be symmetric, so you may lose some information with the symmetry approximation.

  • kpk
    kpk Altair Community Member
    edited July 2022
    acupro_21778 said:

    That seems reasonable.  You may want to make the domain larger - so more distance from the car to the side/top boundaries.  The flow around the car won't necessarily be symmetric, so you may lose some information with the symmetry approximation.

    Thanks for the feed back

  • kpk
    kpk Altair Community Member
    edited July 2022
    acupro_21778 said:

    That seems reasonable.  You may want to make the domain larger - so more distance from the car to the side/top boundaries.  The flow around the car won't necessarily be symmetric, so you may lose some information with the symmetry approximation.

    Is the Turbulence equation SA ok for this kind of simulation or any other should i use ?

  • kpk
    kpk Altair Community Member
    edited August 2022
    acupro_21778 said:

    That seems reasonable.  You may want to make the domain larger - so more distance from the car to the side/top boundaries.  The flow around the car won't necessarily be symmetric, so you may lose some information with the symmetry approximation.

    At the inlet should i give Average velocity or Directional Velocity (X/Y/Z) with respect to Axis ?

    is the Turbulence equation SA ok for this kind of simulation or any other should i use ?

     

  • acupro
    acupro
    Altair Employee
    edited August 2022
    kpk said:

    At the inlet should i give Average velocity or Directional Velocity (X/Y/Z) with respect to Axis ?

    is the Turbulence equation SA ok for this kind of simulation or any other should i use ?

     

    Probably directional (cartesian or normal) velocity is better, and you'll also need to define the turbulence quantities at the inlet.

    Interesting question - some of it depends on what level of fidelity/accuracy you want from the calculation.  Most papers/publications report the need for transient and maybe a DES approach.  AcuSolve supports SA-DES and SST-DES.

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