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Old   November 10, 2012, 02:38
Default River Simulation
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Thiwaan Rao
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I need to create a river flow simulation using ANSYS CFX. But I have some problem with the steps.

I need to show the particle flow together with the wave of the river flow in the simulation.
How can I do it and what boundary condition should I choose?

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Old   November 24, 2012, 09:53
Default river simulation
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Hi Thiwaan,
I try to do something similar. Right now I divided my area of the river in parts of 200m. The problem is that it is still too huge. With a resolution of 0.5 meters I get about 7 Million cells. With some refinements it goes up to 20 Million cells. As you can clearly see it is almost impossible to get an authentic simulation. Furthermore in my case there is a massive loss of water through the top (opening).
If I come up with some helpful results I keep you posted


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Old   December 13, 2012, 15:29
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Fluent does a very poor job with multiphase flow when there is a strong density differential (e.g. air and water). When you try to nail down the free surface, you will find a large area of mixed air and water, which makes no sense! To succeed, you need to use a rigid lid approximation (i.e. a single phase model). This, however, will not capture your waves. If you want waves, you need to try other CFD software. If there is a severely deformed free surface, you may be interesting in Flow-3D, which is designed for free surface flows but is only single phase. They have very sexy volume-of-fluid algorithms.
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