Hi,

I am working on simulating a fluid-solid cooling system in StarCD version 3.10. I have several questions about the conjugate heat transfer.

1) In my case, the fluid region is compressible and there is heat transfer between solid and fluid. I wonder if I should choose total enthaply as a conservation parameter for solving energy equation of fluid.

2) How does StarCD calculate the temperature on the fluid/solid interface? In the manual, it is only said that the continuity of the energy flux is considered.

All opinions are appreciated!

1. you can choose total enthalpy.

2. you have heat flux from solid side, say,

Hflux_solid=(T_wall - T_cell_solid)/D_solid * C

where D_solid is distance between wall and near wall cell in solid, and C is heat conductivity.

Heat flux from fluid side, is,

Hflux_fluid=(T_wall - T_cell_fluid)/D_fluid *Coeff

where the coefficient Coeff depends on if the fluid is laminar or turbulent (in later case, normally a kind of wall function is used). By equating these two heat fluxes, you can then get T_wall, the temperature at solid-fluid interface.

sorry, both equations should be multiplied by the wall face area.

Hi, John!

Thanks for your ideas! The second point you written down about the calculation of T_WALL is just what we means the "CONJUGATE HEAT TRANSFER". I would like to make sure again: Does StarCD calculate the T_WALL in this way? I ask so only because that it is not mentioned in the manual.

Thanks!

Yes, that is how STAR-CD calculates wall temperature at solid-fluid interface.