I am trying to simulate hydrodynamics of a Venturi tube inserted into the vessel already filled with liquid to a certain height, while pumping the other liquid through the inlet. Above the initial level of liquid there should be air.
I tried two methods - first I wanted to create regions, mark them and then patch after initialization, as I saw in some tutorial. Strange things happened, so I am thinking about something else. First I sketched a line across the vessel in the place I want liquid-air interface and then I created two line bodies out of what is above line and below (and that line, to create closed loop). Then I created two surface bodies out of the edges, and wanted to make them a named selections in the meshing. Sadly, although I meshed them together, Fluent is detecting line between them as a wall (and I want it to be simply initial interface between them). What should I do to get rid of this wall between intended liquid and air zones?
Hi,
because I discovered a solution and there are followers to that question, I will answer it myself.
1st solution - After doing what was performed in the question, make a Part of created surfacce bodies (in DesignModeler). As long as they are completely distinct bodies, they will be meshed without connection between them, even if meshing will be simultaneous. As part, they will be meshed properly. To make Fluent know about different fluid zones you intended to create, make a named selection out of all created surface bodies (name them at will). After that, solver should see as many cell zones (named accordingly), as many surface bodies you selected. Choose your model and solving methods, initialize and patch every zone with volume fraction of the fluid you want it to contain. Plot it on the contours to see if all is correct, and proceed with solution.
2nd solution - Don't "play" with line bodies and making surfaces out of edges, but simply create your geometry from several sketches and then create surfaces out of intended sketches. Be ware though to not create them all with Add Material option, because they will combine into single surfacebody. One can be added as material, but any of the neighbouring have to be frozen. This method is even more simple than first, because it doesn't include line bodies (Occam's razor :)...) The rest is the same as in 1st solution.
Warning! Make sure that all of the bodies are Fluids (not Solids) and that you are creating named selections out of Bodies (not Edges!)
Cheers.
Hi,
because I discovered a solution and there are followers to that question, I will answer it myself.
1st solution - After doing what was performed in the question, make a Part of created surfacce bodies (in DesignModeler). As long as they are completely distinct bodies, they will be meshed without connection between them, even if meshing will be simultaneous. As part, they will be meshed properly. To make Fluent know about different fluid zones you intended to create, make a named selection out of all created surface bodies (name them at will). After that, solver should see as many cell zones (named accordingly), as many surface bodies you selected. Choose your model and solving methods, initialize and patch every zone with volume fraction of the fluid you want it to contain. Plot it on the contours to see if all is correct, and proceed with solution.
2nd solution - Don't "play" with line bodies and making surfaces out of edges, but simply create your geometry from several sketches and then create surfaces out of intended sketches. Be ware though to not create them all with Add Material option, because they will combine into single surfacebody. One can be added as material, but any of the neighbouring have to be frozen. This method is even more simple than first, because it doesn't include line bodies (Occam's razor :)...) The rest is the same as in 1st solution.
Warning! Make sure that all of the bodies are Fluids (not Solids) and that you are creating named selections out of Bodies (not Edges!)
Cheers.
you can mark your zone in the Region Adaption panel from adapt by given the dimension and the shape, then patch it before starts simulation.
If you have two different phases (gas-liquid), I think you should use two phases flow .
Thank you. I already figured it out, however still thank you for responding.
Have a nice day.
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