[antoinel]

I am using the Species Transport Model to simulate anisotropic diffusion of acetic acid in water. The domain is 200 m x 200 m. There is no inlet or outlet. I set up the anisotropic diffusion parameters with the UDS (user-defined scalar) diffusivity properties. I expected the simulation to calculate diffusivity based on the UDS diffusivity properties. However, it appeared to calculate the diffusivity based on the mass diffusivity properties. How do I disable the mass diffusivity properties, so that only the UDS diffusivity properties will be enabled?
Thank you,
Lisa