Fluids

Fluids

UDF : Modified DES

    • Bibill
      Subscriber
      Dear all,nI would like to modify the distance function causes the model to behave as RANS in a Detached Eddy Simulation. Is there a possibility to impose our own distance function by means of a UDF ?.Thanks in advance !n
    • Aitor
      Subscriber
      Unfortunately, it is not possible. Why do you want to modify the distance function?n
    • Bibill
      Subscriber
      Thank you Aitor for your answer !I'd like to solve with LES only in a part of the fluid domain, defined by an in-house criterion, and with RANS otherwise.n
    • Aitor
      Subscriber
      In that case, I recommend you to use SBES modeln4.14. Stress-Blended Eddy Simulation (SBES) (ansys.com)nThis is essentially an improvement of the DES model, and you can modify the blending function by means of User-Defined Functions (UDF).nIf the RANS - LES interface is known and the geometry is simple, Embedded Large Eddy Simulations (ELES) are also a good choice.n4.16. Embedded Large Eddy Simulation (ELES) (ansys.com)n
    • YasserSelima
      Subscriber
      search the udf manual for define_trans_flength macron
    • Bibill
      Subscriber
      Thank you very much !! These are the pieces of answer I was looking for !n
    • YasserSelima
      Subscriber
      You are welcome! Good Luck!n
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