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Old   November 11, 2014, 16:44
Post Sediment Scour Model
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John
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Hello all,
I am using the sediment scour model for simulating the flow and settling in a sedimentation tank. My problem is that the suspended sediment never becomes packed (I have specified only the diameter and density for each sediment species and the other settings left to default). If I define an initial packed sediment region (in meshing and geometry), packed sediment is formed. Can you please help me why this is happening?
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Old   November 17, 2014, 12:12
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Jeff Burnham
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Can you tell us what version of FLOW-3D you're using? The v11 scour/deposition model is more reliable than older versions. You need the v11.0.2 patch (or later) to address settling completely - before that bed wouldn't form if there was only one cell of suspended sediment at the bottom, there needed to be at least two cells in vertical direction with suspended sediment concentration. After the patch a single cell of suspended sediment can pack properly.
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Old   November 18, 2014, 09:25
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Quote:
Originally Posted by JBurnham View Post
Can you tell us what version of FLOW-3D you're using? The v11 scour/deposition model is more reliable than older versions. You need the v11.0.2 patch (or later) to address settling completely - before that bed wouldn't form if there was only one cell of suspended sediment at the bottom, there needed to be at least two cells in vertical direction with suspended sediment concentration. After the patch a single cell of suspended sediment can pack properly.
I am using v11.0.1.
Thank you very much for your quick answer. I have another question if you can help me. I have specified 6 different classes with different diameter. I have also set boundary conditions for them with different concentrations. After the simulation I try to find the efficiency of the tank for each sediment species. For some reason, the concentration of the sediment with a smaller diameter in(3rd class) is much smaller than in 4th compared to Cin. So the efficiency of the class with the smaller diameter is bigger.Why is this happening, I am thinking sth wrong?
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Old   November 19, 2014, 05:30
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Ali Adel
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Hello,
I just want to ask you about the average of the running time which you needed to simulate this problem???
Thanks in Advance
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Old   November 19, 2014, 07:38
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The running time depends on different parameters like the size of geometry, the mesh, the computing power of your machine, the finish time that you have selected as input variable.
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