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Reply To: Unit conversion: from LB to physical in terms of the kinematic viscosity

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› Forums › OpenLB › General Topics › Unit conversion: from LB to physical in terms of the kinematic viscosity › Reply To: Unit conversion: from LB to physical in terms of the kinematic viscosity

July 14, 2025 at 12:24 pm #10474
TimBingert
Participant

Hi Aaron,

you are exactly right! Usually in OpenLB, this job is caried out for you by the UnitConverter, i.e. you can use the UnitConverterFromResolutionAndRelaxationTime, which depending on your tau that you input, finds the appropriate timestep size based on your formula. In your case, that might result in a coarse temporal resolution which must not be bad, but if you want to increase temporal resolution under diffusive scaling (constant tau!) you have to increase spatial resolution in LBM.

Hope this helps.

Kind regards
Tim