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April 17, 2016, 13:30 
Scouring Around Bridge Pier

#1 
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Arkan
Join Date: Mar 2016
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Hello To every One
Dear friends I am trying to study local scour around bridge pier and I have tried many differend boundary conditions but I can get logic results my question are 1 I want to set my inlet boundary condition as Inflow ,and I did that also I gave the height of fluid . 2 out let boundary condition pressure with the same height of fluid. 3 fluid region from covers the whole model also I set hydrostatic pressure . 4i activated all parameters (like sediment scour ,renormalized viscosity, gravity z=9.8, density 5 fluid density 1000 ,and (viscosity constant =0.001) . 6i defined my sediment body as packed sediment but I don't have scour what is the problem can you please tell me??or at least if some has a model just send me your prepn file I will really appreciate it . one last question what is the unit of finish time is it second ?? 

April 19, 2016, 07:47 

#2 
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maryam masoomi
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finish times unit is second in SI. I think you should change your shields number its really important maybe you do not estimate it correctly because it was my problem and when I change that my problem was solved.


April 19, 2016, 12:26 
Use of correct parameters

#3 
Member

We have recently partnered with Friendship Systems for geometry optimization and parametric studies using the software CAESES. For sediment scour modeling, parameters like Shield's Number can be determined using CAESES. Once you have the correct value of Shield's Number from CAESES optimization, you can use that value for your case study.
In fact, we used CAESES internally with a sediment scour problem and got excellent results. 

April 20, 2016, 03:23 

#4  
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Arkan
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Quote:
1 what's you boundary conditions . 2 do you insert you whole model in the in calculation or you are using symmetry . 3is defining the particles important or not what does particles are for in physics . and lastly if you send me your (prepin) it will be a very big favor for me . 

April 20, 2016, 03:25 

#5  
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Arkan
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Thank you very much I will try that and let you know about the results thanks again 

April 21, 2016, 06:35 

#6  
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maryam masoomi
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April 24, 2016, 14:33 

#7  
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Arkan
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Quote:
actually at the university we have a work station computer and they installed Flow3D version 11.1 so if you send me your prepin file I can benefit from it really ,I know its not so common but I want to see all the parameter maybe I am having trouble is some where else and I can share my results with you . thanks again and Best Regards 

April 28, 2016, 15:29 

#8  
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maryam masoomi
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Quote:
http://www.cfdonline.com/Forums/flo...entscour.html 

May 5, 2016, 15:02 

#9  
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Arkan
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November 3, 2016, 12:50 

#10  
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hewida
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Quote:
can i ask you question i have two problems 1 sediment grain size is more than ** ** 10% of mesh cell size ** ** higher ratio of mesh cell size to ** ** grain size is recommended 2 if i use big time step value give me error how can i make simulation for 2 hours with small time step 

November 6, 2016, 03:57 

#11  
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hanif pourshahbaz
Join Date: Jun 2016
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Quote:
1) first problem does not important at all But if you want to solve it, U can choose a bigger mesh in sediment part 2) in Tab general, define a little time! for example 10 seconds and after the simulation start to work, go to the Run time option and change it to whatever U want!! for example 10000 and then click to send to solver this make your problem easily solve Regards, Hanif 

November 6, 2016, 15:02 

#12 
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hewida
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Thanks a lot
I will try your advise Thanks for your help Can I ask you again about the time step I will change it or not for big time simulation 

January 19, 2017, 04:04 

#13  
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Hossein
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January 19, 2017, 04:12 

#14  
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Hossein
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pardon me because of my notice, you can not change your time and set it on what ever you want. the time is very important and the right answer is mostly dependent on time because regardless of other part of the SCOUR problem, the equilibrium time plays an important role in local scour. so you should calculate your time with the equations which are related to the balance time 

January 19, 2017, 04:56 

#15  
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hanif pourshahbaz
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Tags 
bridge pier, scour, sediment scour 
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