### 6.8.7. User Control for Heat and Mass Transfer Terms of Wall Particles

In ANSYS CFX, the coupling of heat and mass transfer terms of wall particles into the coupled Eulerian phase can be controlled, similar to the coupling control for regular particles. However, it is not possible to control the coupling on a term-by-term basis, but the coupling is applicable on the global equation level. This means that if the particle energy equation is run in a fully coupled mode, then this will not only apply to regular particles, but also to wall bounded particles (and the wall film they represent). Likewise, if the coupling of the energy equation is set to one-way coupled, then this also applies to the wall particles of that particular particle type. The coupling control for wall particles is essentially identical to what is currently done for regular particles. The same applies to the particle mass transfer equation.

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