Fluids

Fluids

Topics relate to Fluent, CFX, Turbogrid and more

식기세척기 유동

    • 동수 서
      Subscriber

      식기세척기 회전노즐 유동을 확인하려고합니다. 하지만 calculate단계에서 update dynamic mesh failed라고 뜨는데 해결방법이 있을까요?

       

      Thanks to Google (Rob):

      I am trying to check the flow of the dishwasher rotating nozzle. However, in 
      the calculation step, update dynamic mesh failed is displayed. Is there a
      solution?
    • Rob
      Forum Moderator

      Assuming it's a "normal" dishwasher you should be able to use sliding mesh and not need dynamic mesh. That will be faster as you're updating the position of a cylindrical piece of mesh rather than needing to remesh a domain for every timestep. 

      These will provide information on the rotating options (second part is sliding mesh)

      /courses/index.php/courses/vertical-axis-wind-turbine-part-1/

      /courses/index.php/courses/vertical-axis-wind-turbine-part-2/

    • 동수 서
      Subscriber

      PartBodyAssyPrtREMOVE에 저 표시는 왜 생기는건가요?

    • Rob
      Forum Moderator

      You'd need two fluid zones. One for the bulk washer, and a second for the rotating arm & nozzle. 

      The crossed tick means it's OK and something else was checked - look in the Ansys Meshing documentation. 

    • 동수 서
      Subscriber

       혹시 자세히 뭐가 문제인지 모르겠어서 제가한 파일을 보내고 싶은데 메일주소가 있을까요?

    • Rob
      Forum Moderator

      Staff are not permitted to open or download files, nor use direct email contact due to Export Rules. Please ask questions on here. 

    • 동수 서
      Subscriber

      General - Transient

      Model - k-e, Enhanced Wall Treatment

      Inlet - Pressure inlet 75000pa

      Dynamic Mesh - Smoothing, Remeshing, UDF 사용

      Automatic Export 이용했지만 잘안됩니다..

    • Rob
      Forum Moderator

      Are you adding water? Is the mesh quality good? Have you watched the two courses I recommended? 

    • 동수 서
      Subscriber

      자세히 안나와있어서 그런데 모델은 뭘로 써야하나요? 물은 추가 안합니다

    • Rob
      Forum Moderator

      The models may be OK, your problem is that you may want sliding mesh rather than deforming. Please post some images and review the training materials I linked. 

    • 동수 서
      Subscriber

      모델링 할때 remove기능을 이용하여 하나의 파트로 만들었는데 이런 경우에도 가능한가요?

       

    • 동수 서
      Subscriber

      보내준 링크에 메쉬과정이 생략되어있어서 헷갈리네요

       

    • Rob
      Forum Moderator

      Thanks for that. A picture makes things clearer, especially as I'm relying on Google to read Korean! 

      You need to split a cylinder out around each rotating arm (I assume there are two). Those become the sliding mesh zones. It should be shown in the video, but not necessarily the meshing part: you need to review the sliding mesh options: so once you have three fluid zones (rotors & static zone) do NOT use Share Topology. 

      Have a look for mixing tanks on here: it's a similar approach in that the mixer units rotate inside a tank. 

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