CFX! Boundary and initial conditions CFX5.5 V5.5.1H 2001AEA Technology
CFX 5.5 V5.5.1H © 2001AEA Technology 6-1 Boundary and Initial Conditions
CFX! Introduction Boundary conditions are required to set on all external domain boundaries Initial values/guess are required to set for all calculations Boundary conditions and initial values/guess can be either constants or expressions CFX5.5 V5.5.1H 2001AEA Technology
CFX 5.5 V5.5.1H © 2001AEA Technology 6-2 Introduction Boundary conditions are required to set on all external domain boundaries Initial values/guess are required to set for all calculations Boundary conditions and initial values/guess can be either constants or expressions
CFX! Boundary conditions Default external boundary condition: adiabatic, no-slip wall Available boundary conditions: Inlets Outlets Openings Walls Symmetry Planes Periodic Pairs (ggi Periodic not support with Multi-phase flows) It is generally possible to specify different type options for different fluids on the same boundary condition with the same general boundary condition type CFX5.5 V5.5.1H 2001AEA Technology
CFX 5.5 V5.5.1H © 2001AEA Technology 6-3 Boundary Conditions Default external boundary condition: adiabatic, no-slip wall Available boundary conditions: > Inlets > Outlets > Openings > Walls > Symmetry Planes > Periodic Pairs (GGI Periodic not support with Multi-phase flows) It is generally possible to specify different type options for different fluids on the same boundary condition with the same general boundary condition type
CFX! Boundary Condition Forms(single-phase) Actio Object Fluid Boundary Method New Existing Fluid Boundaries Specify name (will be referred to in post-processor) Domains Select boundary condition type Specify boundary condition values Type(nlet Refer Coordinate Frame Select surfaces on which to apply the boundary condition Auto Execute A CFX5.5 V5.5.1H 2001AEA Technology
CFX 5.5 V5.5.1H © 2001AEA Technology 6-4 Boundary Condition Forms (single-phase) Specify name (will be referred to in post-processor) Select boundary condition type Select surfaces on which to apply the boundary condition Specify boundary condition values
CFX制 Boundary conditions a sample values form a Boundary Condition Values Flow Regime Values change according to bc type Mass and Momenturm Inlet- speed/velocity Normal Speed in pressure, mass flow Wall-No slip, free slip Turbulence moving, counter rotating, wall roughness rHeat Transfer Static Temperature pening -velocity, pressure Temperature K Also specify additional variables and mcF/2-Phase settings Some options governed b Additional variables domain settings Expression Editor CFX5.5 V5.5.1H 2001AEA Technology
CFX 5.5 V5.5.1H © 2001AEA Technology 6-5 Boundary Conditions A sample values form Values change according to BC type Inlet - speed/velocity, pressure, mass flow Wall - No slip, free slip, moving, counter rotating, wall roughness Opening - velocity, pressure Also specify additional variables and MCF/2-Phase settings Some options governed by domain settings