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Does laminar model with sufficient resolution mean DNS |
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September 15, 2020, 08:17 |
Does laminar model with sufficient resolution mean DNS
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#1 |
New Member
Visakh
Join Date: Dec 2010
Location: Bangalore, India
Posts: 7
Rep Power: 16 |
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. Last edited by visakhmg; September 15, 2020 at 08:18. Reason: spellcheck |
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September 21, 2020, 13:36 |
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#2 |
Senior Member
Matvey Kraposhin
Join Date: Mar 2009
Location: Moscow, Russian Federation
Posts: 355
Rep Power: 21 |
Hi.
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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