************************* **Viscosity Diffusivity** ************************* :: Viscosity Diffusivity = {model_name} ----------------------- **Description / Usage** ----------------------- This card is used to specify Dr when the model in the *Diffusivity* card is **HYDRO**. Definitions of the input parameters follow for the {model_name} options **CONSTANT** and **LINEAR** based on the model: .. figure:: /figures/449_goma_physics.png :align: center :width: 90% +----------------------+-------------------------------------------------------------------------------------+ |**CONSTANT** |Name of the model for a constant curvature diffusivity. | | | | | | * - An integer designating the species equation. | | | * - Dμ when there is no concentration dependency. | +----------------------+-------------------------------------------------------------------------------------+ |**LINEAR** |Name of the model in which the diffusivity is a linear function of concentration. | | | | | | * - an integer designating the species equation. | | | * - kμ when the diffusivity is a linear function of concentration. | +----------------------+-------------------------------------------------------------------------------------+ ------------ **Examples** ------------ The following is a sample input card: :: Viscosity Diffusivity = CONSTANT 0 0. ------------------------- **Technical Discussion** ------------------------- Please refer to the technical discussion given under **HYDRO** section of the Diffusivity card. -------------- **References** -------------- No References.