Curvature Diffusivity#

Curvature Diffusivity = {model_name} <species> <float>

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:

../../_images/448_goma_physics.png

CONSTANT

Name of the model for a constant curvature diffusivity.

  • <species> - An integer designating the species equation.

  • <float> - Dr when there is no concentration dependency.

LINEAR

Name of the model in which the diffusivity is a linear function of concentration.

  • <species> - an integer designating the species equation.

  • <float> - 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.