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[FAQ]

The variable “Volume of Finite Volumes” (volcvol) is only available at vertices. The error message indicates that CFX tries to evaluate “Volume of Finite Volumes” on a cell center based locator instead where it is not defined, that is, your setup uses the variable “Volume of Finite Volumes” in expressions that are evaluated on different (non-vertex) mesh entities. As a workaround, you can create an algebraic Additional Variable “myVolcVol” (Variable Type “Unspecified”) to hold the value of “Volume of Finite Volumes” and mark the Additional Variable as permanent, e.g. by setting a underrelaxation factor of 1. LIBRARY: ADDITIONAL VARIABLE: myVolcVol Option = Definition Tensor Type = SCALAR Under Relaxation Factor = 1.0 Units = [m^3 ] Variable Type = Unspecified END END ANSYS CFX is then able to interpolate the Additional Variable to other entities than vertices, if you use the Additional Variable “myVolcVol” instead of the solver variable “Volume of Finite Volumes” in any other expression.