Flow Over a Spillway

Nicopep · October 19, 2009, 12:36

Hi everybody!

I'm a new user of OpenFOAM and I need some explanations...

I want to model the flow over a spillway. I have the geometry of the spillway in .stl format. I managed to make a good refined mesh with blockMesh and then snappyHexMesh. Now I have to enter all the boundaries and it's quite difficult for me... I want to use interFoam (it seems that this solver is good for free surface flows, isn't it?).

I explain to you what are the boundary conditions I know:
* at the upstream of the spillway, the fluid depth is constant equal to 15m.
* at the downstream of the spillway, the boundary is open (no condition) (fluid can pass through the boundary)
* at the bottom, I want a viscous condition (velocity equal to 0)
* the surface of the spillway has a Strickler coefficient of 70 (or roughness equal to 3 mm)

How can I model all this? There are such a lot of derived types that I can't understand which one is the good one... Do you have an idea?

Do you know if it exists a dictionary that explains all the types available? because the user guide is not very detailed about that...

To finish has anyone simulated yet something like a flow over a spillway, or a dam?

Thanks for your help!
Best regards.

hani · October 21, 2009, 05:48

Hi Nicolas,

Here you have a master thesis describing such a project done in Fluent:
http://www.tfd.chalmers.se/~hani/pdf_files/Computational_Modeling_of_Flow_over_a_Spillway_fin al_version.pdf

I am very interested in having the same simulation done in OpenFOAM, so you can contact me directly on hani(at)chalmers(dot)se, and I can give you the files. Then I can try to give you a hand on how to set up everything in OpenFOAM.

When we are done, you should write a small tutorial on how to do such simulations in OpenFOAM, and post it in the OpenFOAM Wiki.

What do you say?

Best regards,
Håkan.

October 19, 2009, 12:36	Flow Over a Spillway	#1
Nicopep New Member PEPIN Nicolas Join Date: Sep 2009 Posts: 5 Rep Power: 17	Hi everybody! I'm a new user of OpenFOAM and I need some explanations... I want to model the flow over a spillway. I have the geometry of the spillway in .stl format. I managed to make a good refined mesh with blockMesh and then snappyHexMesh. Now I have to enter all the boundaries and it's quite difficult for me... I want to use interFoam (it seems that this solver is good for free surface flows, isn't it?). I explain to you what are the boundary conditions I know: * at the upstream of the spillway, the fluid depth is constant equal to 15m. * at the downstream of the spillway, the boundary is open (no condition) (fluid can pass through the boundary) * at the bottom, I want a viscous condition (velocity equal to 0) * the surface of the spillway has a Strickler coefficient of 70 (or roughness equal to 3 mm) How can I model all this? There are such a lot of derived types that I can't understand which one is the good one... Do you have an idea? Do you know if it exists a dictionary that explains all the types available? because the user guide is not very detailed about that... To finish has anyone simulated yet something like a flow over a spillway, or a dam? Thanks for your help! Best regards.

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October 21, 2009, 05:48		#2
hani Senior Member Håkan Nilsson Join Date: Mar 2009 Location: Gothenburg, Sweden Posts: 205 Rep Power: 18	Hi Nicolas, Here you have a master thesis describing such a project done in Fluent: http://www.tfd.chalmers.se/~hani/pdf_files/Computational_Modeling_of_Flow_over_a_Spillway_fin al_version.pdf I am very interested in having the same simulation done in OpenFOAM, so you can contact me directly on hani(at)chalmers(dot)se, and I can give you the files. Then I can try to give you a hand on how to set up everything in OpenFOAM. When we are done, you should write a small tutorial on how to do such simulations in OpenFOAM, and post it in the OpenFOAM Wiki. What do you say? Best regards, Håkan.