Re: Discrepancies in Viscous Flux Formulas -- CFD

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Date Posted: 01:55:24 04/27/04 Tue
Author: Karim Mazaheri
Subject: Re: Discrepancies in Viscous Flux Formulas
In reply to: Arastoo 's message, "Discrepancies in Viscous Flux Formulas" on 22:08:52 04/26/04 Mon

>As we see, the four Flux Formulas ,which has beeb
>presented in the Prject #1, make good results,when
>they are used for Invisid mode,but in Viscous,the fail
>to meet the requirment except, Roe's.
>I think the main reason for this(Descrepancy in
>results) ,arise form truncation errors in invisid
>formulas and Diffusion fluxes(viscous fluxes)
>counterparts, which in viscous mode,they are not the
>same order as hey were in invisid itself.
>may be ,diffution terms, dominent,and effect the
>invisid fluxes ,which makes the boundry layer thicker.

The truncation error (of inviscid flux) is like
mu' u_xx .
If mu' < mu x DeltaX , you may get accurate results for viscous, but otherwise, you have more viscosity than physics, which makes the boundary layer ticker.

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