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[FAQ]

The normal solid velocity error in Fluent refers to the velocity that Fluent calculates for the solid energy advection term. This term is active when solid motion is enabled. Solid motion sets up a pseudo velocity in the solid. This velocity must be tangential to the surfaces of the solid at its boundaries. One setup error that could therefore trigger the velocity error is if you have a solid disk about the z axis for which solid rotation is defined about y. One question that should be considered is whether solid rotation is actually required for the modelling. In a heat transfer analysis, solid motion is typically required to (1) prevent a solid that is rotating past a heat source from developing a hot spot, or (2), to simulate continuous, conveyor-type motion of hot solids. One example of the first kind of problem is a disk brake and caliper analysis. The caliper applies friction from a fixed location as the solid disk rotates past it, so any stationary representation of the disk would cause it to develop an unphysical hot spot. Activating solid rotation for the disk adds a tangential advection term to the solid energy equation which carries the heat around the circumference of the disk and allows us to pretend that it is turning. If (1) and (2) above are not the situation being modelled, it may be enough just to rotate the fluid domain that contains the solid zone. The heat transfer process in the solid itself (heat conduction) will be independent of rotation. This is true of most cht problems that involve rotating solids.