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  3. If I specify a wall’s thermal BC type to ‘radiation’ or ‘mixed’, why does the ‘radiation heat transfer rate’ under ‘flux reports’ still calculate 0 for that wall?

If I specify a wall’s thermal BC type to ‘radiation’ or ‘mixed’, why does the ‘radiation heat transfer rate’ under ‘flux reports’ still calculate 0 for that wall?

Tagged: 18.1, fluent, fluent-post-processing, fluid-dynamics, heat-transfer
    • June 5, 2023 at 7:06 am
      FAQFAQ
      Participant

      This flux report computes the heat transfer rate by whichever radiation model you have enabled under the ‘radiation model’ panel. Specifying that a wall has a radiation BC type means that we specify the heat flux at the wall by using the Stefan-Boltzmann law (i.e., such that q = sigma*(T1^4 – T2^4)), but Fluent does not include that flux in the radiation heat transfer rate. If you are not using a radiation model, the radiative flux will always be zero. Saying that a wall has a radiation BC type simply means that we specify the heat flux in the form q = sigma*h*(T1^4 – T2^4). It does not actually enable any of the radiation models. Keywords: flux, radiation, mixed, flux report

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