How much additional computational time should I expect for each passive scalar I add to my domain?
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When using a passive scalar, what additional computational time can be expected?
Each passive scalar requires an additional transport equation to be solved.
In the case of a single phase simulation with the k-Epsilon turbulence model, the increase in computational time is about 8% per passive scalar.
In the case of an Eulerian two-phase simulation with the k-Epsilon turbulence model, the increase in computation time is around 3.5% per passive scalar.
See also Simcenter STAR-CCM+ User Guide sections:
Simulating Physics > Modeling Passive Scalars
Theory > Species and Passive Scalars > Passive Scalars Transport
KB Article ID# KB000031540_EN_US