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How to find reattachment length in Backward Facing step flow

Posted 24.12.2011, 18:12 MEZ 3 Replies

Vaitheeswaran Gnanaraj
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I am using CVOMSOL to Model the gas flow through microcahnnel. I wish to find the reattachment length of nitrogen gas. How to find it using COMSOL 3.5a
3 Replies Last Post 25.12.2011, 14:21 MEZ
J
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Posted: 1 decade ago 24.12.2011, 20:24 MEZ
Hi,

you can calculate the streamline with zero velocity as shown in the model "Turbulent Flow Over a Backward Facing Step". Another way is the check where the wall shear stress changes direction.

Best,
J
Hi, you can calculate the streamline with zero velocity as shown in the model "Turbulent Flow Over a Backward Facing Step". Another way is the check where the wall shear stress changes direction. Best, J
Vaitheeswaran Gnanaraj
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Posted: 1 decade ago 25.12.2011, 05:50 MEZ
Thank you for your reply. How to plot rattachment length versus Re
Thank you for your reply. How to plot rattachment length versus Re
J
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Posted: 1 decade ago 25.12.2011, 14:21 MEZ
Probably the best way is to export the data and to use Matlab, at least that's what I do. Perhaps you can find the coordinate of the limiting streamline at the wall and plot that one against the Re, but normally I do the post-processing outside COMSOL.

J
Probably the best way is to export the data and to use Matlab, at least that's what I do. Perhaps you can find the coordinate of the limiting streamline at the wall and plot that one against the Re, but normally I do the post-processing outside COMSOL. J

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