Surface roughness with dambreak question

kcc49 · April 18, 2018, 11:24

Hello all,

I have been working on a dissertation which is on the topic of dam break and surface roughness relationship and currently, I am using the model base on the dambreakwithobstacle in tutorial.

For some reason no matter how I change the value of Ks and Cs in 0/nut, it has no effect on final result but I have no idea why.

the setup of the model file is uploaded to google drive: https://drive.google.com/open?id=10R...GKOwE0Az8OfBIf

If you guys have time would you mind take a look at whats wrong?

Many thanks!
Jesse

kcc49 · April 18, 2018, 11:27

Quote:

Originally Posted by kcc49

Hello all,

I have been working on a dissertation which is on the topic of dam break and surface roughness relationship and currently, I am using the model base on the dambreakwithobstacle in tutorial.

For some reason no matter how I change the value of Ks and Cs in 0/nut, it has no effect on final result but I have no idea why.

the setup of the model file is uploaded to google drive: https://drive.google.com/open?id=10R...GKOwE0Az8OfBIf

If you guys have time would you mind take a look at whats wrong?

Many thanks!
Jesse

for some reason, the above link doesn't work this should be working

https://drive.google.com/open?id=10R...Q3GKOwE0Az8OfB

Taataa · April 18, 2018, 23:53

Because your case is laminar! nut is turbulent viscosity if the case is laminar it doesn't calculate nut. Set it to RAS and pick a turbulence model such as SST or realizable.

April 18, 2018, 11:24	Surface roughness with dambreak question	#1
kcc49 New Member Jesse Cheung Join Date: Apr 2018 Posts: 18 Rep Power: 8	Hello all, I have been working on a dissertation which is on the topic of dam break and surface roughness relationship and currently, I am using the model base on the dambreakwithobstacle in tutorial. For some reason no matter how I change the value of Ks and Cs in 0/nut, it has no effect on final result but I have no idea why. the setup of the model file is uploaded to google drive: https://drive.google.com/open?id=10R...GKOwE0Az8OfBIf If you guys have time would you mind take a look at whats wrong? Many thanks! Jesse

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April 18, 2018, 23:53		#3
Taataa Senior Member Taher Chegini Join Date: Nov 2014 Location: Houston, Texas Posts: 125 Rep Power: 13	Because your case is laminar! nut is turbulent viscosity if the case is laminar it doesn't calculate nut. Set it to RAS and pick a turbulence model such as SST or realizable.