[FLASH-USERS] Flash use for incompressible turbulence

[Mordecai-Mark Mac Low]

Hi Akash,

The Flash code is tuned for compressible flow: it solves the transport equations with a Godunov shock capturing method.  However, it is a low-order method (second or third order as chosen), which will not give particularly good accuracy.

Incompressible turbulent flow problems are therefore usually solved with either high-order or spectral methods that do not work well in the presence of shocks, but are much more accurate for smooth flows.

Best,

Mordecai

On Feb 4, 2024, at 7:08 AM, flash-users-request at flash.rochester.edu wrote:



On Jan 30, 2024, at 5:13?PM, Akash Rodhiya <ar8303 at nyu.edu> wrote:

Hello everyone,

I am planning to use Flash for the Homogenoues Isotropic Turbulence. In
the Hydrodynamic test problems under *The Supplied Test Problems, *I saw
section 34.1.9: Driven Turbulence "StirTurb" in the Flash user guide.

I thought of using it, but I doubt whether it solves Navier-Stokes with
diffusion term. Because in chapter 14: Hydrodynamics units, the
guide mentions that "The Hydro unit solves Euler's equations for
compressible gas dynamics...".

Has anyone used Flash for incompressible pure hydrodynamic problems? Can
flash be used for the Homogenous Isotropic turbulence problem? Please let
me know if I can provide additional information for the issue mentioned.

Thanks and regards,
Akash Rodhiya
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Mordecai-Mark Mac Low (he/him)  Curator-in-Charge & Professor
+1-212-496-3443          Department of Astrophysics
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                200 Central Park W, NY, NY, 10024-5102, USA

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