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Velocity of flow v time

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Old   August 30, 2012, 23:51
Unhappy Velocity of flow v time
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Ant Burrows
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I'm hoping you can help me out here. It'll probably turn out to be quite a simple thing to do, but I can't fathom out how to do it.

I have a modelled and meshed a flow meter that features vortex shedding using Ansys Workbench 12.1 or 14, depending which computer I use. It's in 2D and I'm using the k-epsilon model.

Firstly, as the flow is constantly switching from side to side of the bluff body in the middle of the flow meter, as it should, I assume that it is unlikely to converge or take a long time to converge unless I change the convergence criteria from the defaults (I've run simulations with a modest mesh for hours without convergence). Is this correct/likely?

Secondly, to determine the flow rate through the meter, I wish to determine the frequency of the flow as it switches from side to side of the bluff body as this is proportional to the flow rate. I've set a surface monitor close to the bluff body to measure the velocity of the flow and when the simulation is run a plot shows the velocity to increase and decrease. However, this is velocity v iteration. I'd like velocity v time. How can I do this?

Finally, I'd like to create a set of contour plots at set intervals of time to show a complete cycle of the oscillation of the flow either side of the bluff body. This is related to the second point in that I am not aware of how to determine time as opposed to iteration. Is there a tool or way of doing this?

Any help on any of these points is greatly appreciated.


Ps if you need more info, let me know.
MitsubishiEvo6 is offline   Reply With Quote


ansys 12.1, convergence, time dependence plot, velocity, vortex shedding

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