AdvancedTraining_9_Initial_Conditions.pdf

Initial Conditions,Boundary Conditions

Initial Conditions
-In steady state, initial conditions can affect rate of convergence
-Nearer the solution the better
-In transient calculations, initial conditions are critical
-Represent conditions at t=0
-Can set initial conditions:
-Fixed value over domain
-Fixed value over initial subdomain
-From existing solution on disk
– Grid must correspond exactly
-Default initial conditions are:
-Temperature at global ambient

Boundary Conditions
-Boundary conditions
-At solid-fluid surfaces friction is applied as sink of momentum
-Heat transfer applied as heat source in fluid, heat sink in solid
-Resistances act as sink of momentum
-Fixed flows & external fans act as sources of mass and momentum
-Internal fans act as sources of momentum
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