Y+ value for K epsilon turbulence model

Jagan Adithya Elango
Jagan Adithya Elango Altair Community Member
edited November 2023 in Community Q&A

Hello experts,

I'm trying to perform a steady state conjugate heat transfer simulation with K epsilon turbulence model.

In my problem, water glycol mixture flows through a liquid cooling channel of cross section 5*15mm at a flow rate of 10LPM. For the Y+ value of 30 the first layer height is over 0.5mm for the specified condition which seems pretty coarse.

Need your advice regarding whether is it strictly required to maintain Y+ values above 30 while using K epsilon model?

Thanks.

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Answers

  • acupro
    acupro
    Altair Employee
    edited November 2023

    The wall functions in AcuSolve are valid through the entire boundary layer, so there really is no lower Y+ limit.

    As a side note, if you really want to say with k-epsilon models, the realizable is typically better than the standard.

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