Fluids

Fluids

CFD Septic tank modelling

    • Zainabf
      Subscriber

      Hello 


      I have just downloaded the ANSYS FLUENT 19. Software. i wanted to know if there are any tutorials to simulate the flow of water in septic tanks ? 


       


      Thanks 

    • Raef.Kobeissi
      Subscriber

      Can you provide more information about the Physics of your problem? Is it an open tank or  pressurised ? 

    • Zainabf
      Subscriber

      We are designing a septic tank to collect wastewater effluent through an inlet pipe. We want to model the the flow of water within the tank from the moment it enters until it exits through an outlet pipe. It is not a pressurized tank. Also, we want to show the settling of sludge at the base of the tank. i have attached below a sample of a septic tank that we are trying to model. Septic Tank Model

    • Zainabf
      Subscriber

      Any updates?


       

    • Raef.Kobeissi
      Subscriber

      Hi,


      Your model contains large solid particles mixed with a fluid so I wouldn't recommend to use the DDPM model because it can only model small particles. You might want to explore the MPM ( Macroscopic particle model) this is a separate module that can be added in Fluent. I will try to find out more information about it and come back to you. 


      As for the filtering process, you need to use the porous medium model:



       


       


       


       


       


       


       


       


       


       


       


       




    • Zainabf
      Subscriber

      Hi


      The filtering process at the outlet is not required. My aim is to just model the flow of wastewater through the inlet pipe (while the tank is 70-80% full), how the effluent is then going to go through the baffle and exit through the outlet pipe. Is it possible to show settling of the particles by any chance ?


      Thanks 

    • Raef.Kobeissi
      Subscriber

      Hi Zainab,


      Yes, you can see how many particles settled on the bottom wall of your model that is if you are using DPM model. Now for large particles, I wouldn't recommend to you DPM you will need the MPM model.

    • Zainabf
      Subscriber

      Hello 


      I am trying to run the model with 50% to 80% full tank. However, I am having some trouble at marking my 3D model. Even though i specify the coordinates in region adaptation, when i calculate the results, my tank is empty. Any idea how I can resolve this issue? Also, will it be possible for you to check my model and suggest changes? 

    • Raef.Kobeissi
      Subscriber

      Can you attach your project and I will have a look at it.


      Regards

    • Zainabf
      Subscriber

      Do you mind if i email it instead as I am getting an error message saying the file extension is not allowed?

    • Raef.Kobeissi
      Subscriber

      I can't provide my personal email address unfortunately can you try to save the case file, zipp it and attach it in here?

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