Fluids

Fluids

How to simulate 3D analysis of water flow(open-channel flow) for an undershot turbine.

    • Vinod Kumar
      Subscriber

      Hello all,


      I am doing my FYP under title as entitled above, in this simulation our objective is to find the the rotational speed and maximum power with variation of flow depth.


      I am unable to start my simulation, I've got problems with defining boundary conditions, unnecessary boundaries are being created(image attached.). Kindly help me out.  Give some guideline to start.


      Thankyou.


       


       


       


      Figure shows unnecessary boundary conditions

    • Raef.Kobeissi
      Subscriber
      Hello VINOD It appears to me that you have multiple objects that are sharing interfaces between each other (contact region). You have to make sure that contact regions between fluid objects or fluid-solid objects should be assigned as ‘Interfaces’ and you need to couple them in the Interface Window.
      Cheers
    • Vinod Kumar
      Subscriber

      Thanks for your kind reply, I am new to Ansys. Kindly share some material/videos that could help me in this regard, if you can.

    • Vinod Kumar
      Subscriber

      I've watched your tutorial "

      " here you start directly with fluent. I'd like to know about the initial steps of your tutorial. 

    • Raef.Kobeissi
      Subscriber
      Hi Vinod Have a look at this tutorial, you can use a similar methodoly to simulate Turbines but you need to remember to use the VOF Multiphase model:

      Also, I have a wide range of tutorials on my channel which could help you solve your problem, please have a look here:
      https://www.youtube.com/TheFiravia
    • Raef.Kobeissi
      Subscriber
      The initial steps is to create your geometry and then mesh. You can find many tutorials on modeling and meshing by visiting ANSYS How To youtube channel and also visit my channel for a lot of examples:
      https://www.youtube.com/user/ANSYSHowToVideos
      https://www.youtube.com/TheFiravia
    • Vinod Kumar
      Subscriber

    • Vinod Kumar
      Subscriber

      Dear Raef Koebessi, I've only one question regard boundary condition.


      In you tutorial, you're defining mesh interface(b/w domain & inner domin) to interior, while you didn't even named it as interior or anything else. 


      In my case this interface are being read as a wall (I am using "read multiple mesh file" technique).

    • Raef.Kobeissi
      Subscriber
      Hi!
      There is a slight difference between 2D and 3D simulation. My simulation was a 2D model therefore the interface between the 2 domain has been automatically allocated as interior. For your case I would auggest not to create 2 domain but only one which encompasses the wall of the turbine.
      Cheers
    • Vinod Kumar
      Subscriber


      This image is the result after flow time 1.196s, I am worried about it's orientation. Kindly guide me, how tackle this problem. 


      Syntax/structure of  udf file for dynamic mesh motion is:


      #include "udf.h"


       


       DEFINE_SDOF_PROPERTIES(stage, prop, dt, time, dtime)


       {


         prop[SDOF_MASS]   = 1576.66;


         prop[SDOF_IXX]  = 2146.055;


         prop[SDOF_IYY]  = 2146.05;


         prop[SDOF_IZZ]  = 1920.10;


         printf ("nstage: updated 6DOF properties");


       } 

    • Vinod Kumar
      Subscriber

    • Vinod Kumar
      Subscriber

      Any suggestion??


       

    • Vinod Kumar
      Subscriber

      Raef, peteroznewman or anyone else would like to help me about this?

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