************************* **Curvature Diffusivity** ************************* :: Curvature 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/448_goma_physics.png :align: center :width: 90% +----------------------+-------------------------------------------------------------------------------------+ |**CONSTANT** |Name of the model for a constant curvature diffusivity. | | | | | | * - An integer designating the species equation. | | | * - Dr 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. | | | * - kr when the diffusivity is a linear function of concentration. | +----------------------+-------------------------------------------------------------------------------------+ ------------ **Examples** ------------ The following is a sample input card: :: Curvature Diffusivity = CONSTANT 0 0. ------------------------- **Technical Discussion** ------------------------- It was proposed that adding a curvature contribution of the diffusive flux for suspension particles would correct suspension migration behavior in parallel-plate and cone-and-plate. However, this correction term is not frame-invariant; hence, it cannot be used in generalized flow geometry. It is therefore not recommended. -------------- **References** -------------- No References.