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[ICEM] Velocity flow inside MRF zones

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Old   April 23, 2016, 13:55
Default Velocity flow inside MRF zones
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shuk
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Hello everybody,

i have meshed(tetra) a cylinder with concentric cylinder as rotating zones by :

> mesh concentric part [in ICEM]

>mesh outer part [in ICEM]

>import meshes to fluent (by append the case) [in fluent]

> mesh interfaces of the shadow wall [in fluent]

>assigned the rotating part as frame motion with rpm of 600 [in fluent]

>assigned velocity magnitude of velocity inlet [fluent]

> assigned model+solution method [fluent]

> RUN [fluent]

>1st pic meshes & 2nd pic velocity pathlines



Should the vector at velocity inlet start swirling as soon it flows into static domain before it reach the rotating part as in the picture???

by reffering to my previous posthttp://www.cfd-online.com/Forums/flu...-boundary.html and
Quote:
Originally Posted by LuckyTran View Post
To suddenly turn a fluid would require infinite force and energy. It must act over a finite length scale.

Navier-Stokes equations are elliptic, information (shear in this case) can propagate upstream. i.e. the downstream rotating fluid can drag the upstream fluid and also cause it to rotate. Laminar flows are dominated by momentum diffusion so this seems applicable. You can do some rough calculations to see if the shear stress is of the right order of magnitude.
Can someone explain about this, please
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