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Does laminar model with sufficient resolution mean DNS

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Old   September 15, 2020, 07:17
Default Does laminar model with sufficient resolution mean DNS
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Hello everyone,

I am running a free convection (Rayleigh-Benard) simulation using buoyantPimpleFoam. Does a laminar model with sufficient grid & time resolution to resolve the Kolmogorov scales and boundary layers make it a DNS? The flow field is expected to be turbulent at the Rayleigh number I solve for. As far as I know, Direct Numerical Simulation means solving the original NS (+ energy) equations without any modeling terms for the turbulence, which is what laminar solver does.

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Old   September 21, 2020, 12:36
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Theoretically - yes, but in practice - no. There are a lot of other things, which introduce errors - pressure-velocity coupling algorithm, BC's , etc.

In other words, when you use mesh with sufficiently fine resolution, the solution could tend to wrong due to approximation errors, which are not induced by discretization of equations terms.
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buoyantpimplefoam, dns, turbule modelling, turbulence

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