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[FAQ]

At the intersection of a specified temperature boundary and an adiabatic wall, there is ambiguity as to which condition should prevail. CFX solves the conservation equation for the nodes on all these boundaries all the time, and uses the specified temperature to close the flux through the boundary faces. However, this closure can support negative coefficients (and hence out-of-bound temperatures) when the boundary face area is larger than the ‘interior’ face area (ie. concave surfaces). To obtain bounded values, preform the following steps: – Set the expert parameter (not in the GUI): boundary diffusion scheme = 3 – Make the adiabatic planes symmetry planes. – Display hybrid values