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[FAQ]

If the following adjoint solver residuals are shown: Computing the adjoint for observable myObservable Iter Adjoint-continuity Adjoint-xMom Adjoint-yMom Adjoint-zMom Adjoint-Flowrate Adjoint-energy 1 -nan 0.00000e+00 0.00000e+00 0.00000e+00 0.00000e+00 0.00000e+00 Invalid arithmetic operations – exiting. ! Adjoint solution is converged then you have probably applied non-constant material properties. Only the density can be defined as either a constant or a compressible ideal gas. All other fluid properties should be defined as constant.