Boundary conditions in a spillway
 

Hi. I was trying to model the flow in a spillway but at the moment im having some problems in boudary conditions. I would like to difine the entrace fluid elevation but my geometry isnt ortonormal to the axis.

I have another question related to the mesh. I want to create a mesh only where spliway is. I just dont know if that is possible and how to do it. I will attach a image.

http://s18.postimage.org/wc5c8jhy1/s...ow3_D_mesh.png

As far as I know, your geometry has to be aligned with the axis since you can only specify the initial pressure field in x, y or z direction. For, creating the mesh, you should try the multi block meshing technique. It would definitely save you a lot of time considering your geometry. I am new to Flow-3D, so maybe someone else can answer you better.

I read that i can use stl file to define where initial water is and then let the gravity works. I just dont know how to do it. Anyway wont multi block extend the simulation time? and increase truncation errors?

Multi block technique would definitely be faster! Instead of meshing the whole block domain you can just focus on the region where the spillway is. See Flow-3D help for more details (Multi-Block Meshes). I don't think so it would be a cause of significant errors provided there is a smooth transition between adjacent mesh blocks.

Also go through the "Reducing Memory Use" topic in FLow-3D help, it might be useful.

thanks a lot. I will use multi-block for sure. Anyway i will need to know the flow caractheristics in certain sections. I read that i will need to use baffle. How can i set baffles in exact location that i need? Can i draw a plan in autocad and then use stl plan to turn into a baffle?

I don't think u need to do that. Please check 'Flux Surfaces' in help.

I have free surface profiles in certain sections in the tunnel from physical model and i need to compare that profiles to results in my CFD model.

http://s8.postimage.org/qem9cduut/ph...results_ex.png

I will like to ask if anybody has some idea to get free surface section profiles for a certain section from my CFD model. Maybe i will need to use a post-processor software right?

Im trying to open the results with Paraview but i just cant :S

Can somebody help me please?

anyone? I tried with EnSight free, but there are some limitations that make it impossible to opening the file.