Fluids

Fluids

How to make pulsed flow on fluent?

    • Najib.Sarbini
      Subscriber

      Im really new to ansys fluent and i need to figure how to make pulsating flow on fluet,


      my case study is a 2d rectangular tank with one crossflow and one pulsating jet at the bottom of the tank.

    • Keyur Kanade
      Ansys Employee

      Do you want to do it in AIM or in Fluent?


      Regards,


      Keyur

    • Najib.Sarbini
      Subscriber

      Fluent

    • Keyur Kanade
      Ansys Employee

      Moving to Fluid Dynamics category. 


      Regards,


      Keyur

    • Najib.Sarbini
      Subscriber

      Alright thank you

    • Rob
      Ansys Employee

      At present you'll need a User Defined Function or transient profile to do the pulsed flow.  The former is covered in the Customisation Manual, the latter in the User Guide. 

    • DrAmine
      Ansys Employee

      I want to add to what rwoolhou already wrote: Is the pulsation for an inflow boundary?

    • Najib.Sarbini
      Subscriber


      Im not sure what you meant, but the pulsation comes from the ejected jet.


      Thank you in advance

    • Karthik R
      Administrator
      Hello
      Rwoolhou and abenhadj are suggesting that you use ‘User Defined Functions (UDFs)’ or ‘Profiles’ in Fluent to create a pulsating jet. UDFs are codes based on some Fluent macros where you can write an analytical expression for your velocity as a function of time. This UDFs will be compiled, loaded, and hooked to your Fluent case as a boundary condition. You can find more information about this UDF in the Fluent customization manual.

      About ‘profiles’ - profiles are external files which contain information about the velocity of your pulsating jet as a function of time. These files can directly be read into Fluent. You will need to create these files in a specific format, which can be found in the Fluent Users Guide.

      I hope this clarifies both their answers.

      Best Karthik
    • DrAmine
      Ansys Employee

      To clarify my question: Is the velocity you provide at your inlet constant or does undergo a pulsating profile.


       


      If the velocity at the inlet is not really pulsating (say behaving as sin profile) which  I think actually, then the jet pulsation itself in the core will be due to external destabilizing forces and other stabilizing forces (surface tension forces if you are injecting liquid into a gas and viscous forces)

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