K_Factor_Flow_With_Choking

Syntax

Bc Bulk_Node_Coupling For Density [{of} SpeciesName | {in} MaterialPhaseName | {ls} {a | b | c}] {on} Mesh Extent Name [Touching TouchingMeshExtent | Opposing OpposingMeshExtent] = K_Factor_Flow_With_Choking [Using Data Specification Data Spec Name] [Critical_Pressure_Ratio = critical_pressure_ratio | Flow_Rate_Limiter = flow_rate_limiter]

Summary

Volumetric flow rate, Q, calculated as Q = K \sqrt{\frac{(P_{high} - P_{low})} {\rho}} for \frac{P_{high}}{P_{low}} < R_p, where R_p is the critical_pressure_ratio. Above R_p the flow rate is calculated as Q = K * \sqrt{\frac{P_{high}(1 - 1/R_p)}{\rho}}. Absent any other sources, the maximum flow rate is defined based on the mass loss to achieve pressure equilibrium and the fluid time step. If the optional flow rate limiter is specified, the flow rate is limited by the product of the limiter factor and the maximum flow rate without any other sources.

Parameter

Value

Default

{of}

{of | species | subindex}

–

SpeciesName

string

–

{in}

{in | material_phase}

–

MaterialPhaseName

string

–

{ls}

{levelset_phase | ls}

–

{on}

{@ | at | for | in | on | over}

–

Mesh Extent Name

string

–

TouchingMeshExtent

string

–

OpposingMeshExtent

string

–

Data Spec Name

string

–

critical_pressure_ratio

real

–

flow_rate_limiter

real

0