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Institut für
Informatik
Schwerpunkt
Wissenschaftliches
Rechnen
Practical Course SC & V
More on Boundaries
Dr. Miriam Mehl
Examples
Boundary Conditions
• NOSLIP
• FREESLIP
• INFLOW
• OUTFLOW
flexibility
 additional input parameters
 problem-specific routines
easiness,
efficiency
New Algorithm
•
compute time step dt
•
set boundary values + specific boundary values
•
compute preliminary velocities
•
solve pressure equation
•
compute final velocities
General Geometries
• flag field: obstacle & fluid
• restriction to NOSLIP
 bit-coded cell- and boundary-types
New Algorithm
•
compute time step dt
•
set boundary values + specific boundary values
•
compute preliminary velocities
•
solve pressure equation
•
compute final velocities
Pressure Boundaries
• given pressure difference / values
 u and v: Neumann boundary
 new input parameters
 new flags
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