How can I get flow velocity on 2020 R1

- March 11, 2020 at 7:00 am
  
  skikuchi
  Subscriber
  
  I can't get the result of flow velocity on surface by chart. Why can't I measure the flow velocity for fluid analysis? If this is a bug, we need to get a patch for fixing it as soon as possible. This is so critical, and please think about releasing a patch.
- March 11, 2020 at 10:33 am
  
  Gaurav Sharma
  Subscriber
  
  Hi KKC
  
  Discovery Live follows no slip boundary condition by default. Hence, the particle velocity at any surface is equal to the velocity of surface itself. When you try to extract velocity at any stationary surface, it is expected to give zero value as result.
  
  I tried the chart option to measure velocity on a surface in a sample model where, I applied Swirl on the surface. As expected, the velocity output I got was equal to the velocity of the surface.
  
  I hope that explains the reason behind your observation. Please let me know if there is any further confusion.
  
  Best Regards,
  
  Gaurav
- March 12, 2020 at 3:03 am
  
  skikuchi
  Subscriber
  
  Hello Grarav, See the attached file, please. The left is 2019 R3 and the right one is 2020 R1. You can see the difference of the both of Face Chart. We can get the result of slip boundary on 2019 R3, but we can't it on 2020 R1. This is what I want to know why.
- March 12, 2020 at 3:06 am
  
  skikuchi
  Subscriber
  
  I made a mistake to attached a file. This is right one.
  - March 12, 2020 at 6:57 am
    
    Gaurav Sharma
    Subscriber
    
    KKC
    
    I could reproduce your observation. Prima facie, it seems results with 2019R3 were incorrect and necessary changes are made in 2020R1 so that no slip conditions are appropriately respected. However, I am confirming this internally and will get back to you with final response soon.
    
    Best Regards,
    
    Gaurav
- March 12, 2020 at 7:30 am
  
  skikuchi
  Subscriber
  
  Hello Grarav,
  
  Thank you for your reply.
  
  I' ll wait for you final answer.
  
  Regards,
  
  Shoichi
  - March 12, 2020 at 10:53 am
    
    Gaurav Sharma
    Subscriber
    
    Hi Shoichi,
    
    I got the confirmation that my understanding was correct. The results with 2019R3 are incorrect and not to e referred. With the corrections incorporated in recent release, 2020R1 gives you correct results. It is also justified that the velocity values at stationary surface is zero, due to no slip condition.
    
    Thanks & Regards,
    
    Gaurav
- March 13, 2020 at 4:19 am
  
  skikuchi
  Subscriber
  
  Hello Grarav,
  
  Thank you for your investigation.
  
  I understand that it has been incorrect till 2019 R3 and has fixed from 2020 R1.
  
  Thank & Regards,
  
  Shoichi

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