.TRANSFORM.Fluid.Pipes.GenericPipe_wWall_wTraceMass.DiffusionCoeff_wall .TRANSFORM.Fluid.Pipes.GenericPipe_wWall_wTraceMass.DiffusionCoeff_wallDiffusion Coefficient
model DiffusionCoeff_wall = TRANSFORM.Media.ClosureModels.MassDiffusionCoefficient.Models.GenericCoefficient;