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sfo-project / 2D-flow-over-flat-plate-VOF-turbulent

Numerical methodology to simulate turbulent flow over a flat plate in O.
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issue_01 #1

Open teymourj opened 7 years ago

teymourj commented 7 years ago

I want to ask for your advice regarding my free surface simulation of flow past plate. I was trying for several days to set up the correct BC for my case. I am simulating flow past plate with Re=50000. I am using interFoam to see the effect of free surface on this case. The water level is few centimetres above the pate. Its a 2D simulation with turbulent model using RAS.

I tried several BC based on the tutorial in openFoam and some suggestion in the cfd-online forum. Unfortunately, I am doing something wrong, I cant keep the water level at a constant level. After a while all the water will be washed out of the domain. I know it for sure that I made a stupid mistake in the setting but I cant see it.

mojtabaAmiraslanpour commented 7 years ago

Dear @Bash-hassan Hi. I finally got time to take a look at the cases and perform some test. I haven't been able to solve the problem for now but fortunately I found a thesis titled "Two-Phase pipeflow simulations with OpenFoam". This is actually the thing we are searching for. If we can simulate a test case in a channel (That would be the case without the plate) similar to the simulations which are done in this thesis, everything will be OK. I took a look at the BC's and there are some facts in there. First you were right, the totalPressure boundary has to be used at top boundary. Second it is highly recommended to split the inlet boundary into two parts each corresponding to one phase. Anyway I guess everything will be OK if we follow the steps in there. You may download the thesis from here: https://brage.bibsys.no/xmlui/handle/11250/235256

Bash-hassan commented 7 years ago

@mojtabaAmiraslanpour . Hi ,

Thanks a lot for your input. I already did a case with two inlets and single outputs. The behaviour was much better for the first few seconds, but then the water will goes down or up depending on BC combination. I hope this thesis will give me some information. I will read it and implement it to my case. I will give you an update .Also, I am running a case with single input but with laminar behaviour, it's now at the 10 second and the behaviour looks good . I will also update you on that. Thank you for all your time and efforts.

mojtabaAmiraslanpour commented 7 years ago

@bash-hassan Great. I am very much sure if you can successfully run a simple channel flow similiar to this thesis, everything will be fine for further steps.