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Sediment layer for scouring problem

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Old   February 20, 2014, 03:49
Default Sediment layer for scouring problem
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Sugonghak PC Bang
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Hello everyone. I am still new to scouring simulation in Flow-3D. I have a basic question to ask, which is "How to generate sediment layer for scouring simulation?".

I have specified my initial fluid region, especially the Z minimum. Is everything below Zmin sediment? Else how do I "place"/"locate" my sediment? I know my flow depth, and I would like the sediment to be right below the flow depth. But how?

Also, an extra small question is that what does "packed sediment concentration" mean? How to actually determine the value?

Appreciate if anyone could help. Thanks!
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Old   March 1, 2014, 09:02
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you must define component and select " packed sediment" in component type,then edit it in subcomponent-limiters
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Old   March 2, 2014, 20:49
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Quote:
Originally Posted by m.poorjafar View Post
you must define component and select " packed sediment" in component type,then edit it in subcomponent-limiters
Thanks m.poorjafar. But I'm using 9.3 version. Probably I don't have the features you mentioned above...? o.O
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Old   March 4, 2014, 18:14
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in this version : in "initial" , front the packed sediment, specified density of sediment, and in "limiters" specified location of packed sediment
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Old   March 6, 2014, 07:52
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Quote:
Originally Posted by m.poorjafar View Post
in this version : in "initial" , front the packed sediment, specified density of sediment, and in "limiters" specified location of packed sediment
Ok.thanks.

By the way, one very simple yet "deadly" question. what is the viscosity of water at 20 degree (in SI unit)? I found out it should be 1.0E-06, but why is the default setting in Flow 3D shows 0.001? I am confused. Please help!!

Last edited by sycst911; March 6, 2014 at 21:34. Reason: answer has been found
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Old   March 6, 2014, 21:37
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sorry. I have found the answer. thanks!
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Old   March 6, 2014, 21:41
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My last problem remaining is that my sediment tends to be washed off too easily within seconds. I am not sure how to manipulate it despite varying all the values of "critical sediment fraction", "cohesive sediment fraction", "packed sediment concentration". Manipulating these values seem doesnt help much.. Is there any other way to make my sediment binds more tightly (higher cohesiveness)? obviously i couldnt change the sediment diameter, density, Shields parameter, etc. Please help me...

*Why is the angle of repose -90? I thought it is supposed to be 30 for sand, normally speaking.
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