surface to volume ratio in non-equilibrium porous model of fluent

    • Weiqiang Liu

      Hi all,

      I am trying to model hydrogen combustion in porous zone with fluent. The temperature of the porous solid and fluid is different. However, I did not use non thermal equilibrium model in fluent. Instead, I used a UDS to solve transport equation of solid temperature and I defined a volume convective heat transfer rate between solid and fluid. 

      When setting the reaction panel of the fluid panel, I am confused about the surface-to-volume parameter. I think this is a parameter that is used in non thermal equilibrium model of fluent. Because I noticed there is a convective heat transfer rate hv defined in the default non thermal equilibrium model. With this hv and surface-to-volume ratio, fluent solver can calculate volume heat transfer rate.

      My question is: since I am using my own non thermal equilibrium model and solid temperature equation are solved by UDS. Therefore, I can leave this surface-to-volume parameters to a random number.

      Am I right?

      Best regards


    • wcao
      Ansys Employee

      Hi Weiqiang,

      The surface-to-volume ratio as shown in the your post is for surface reaction instead of thermal purpose so that it appears under the reaction tab. For more details, you can refer to the theory guide: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v202/en/flu_th/flu_th_sec_species_surface_bc.html?q=surface-to-volume%20ratio



    • Weiqiang Liu

      Hi Weiyu,

      Thanks very much! I geit it.

      best regards


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