Natural Convection in enclosed container with EDEM particles

Rajani Kant Baro
Rajani Kant Baro Altair Community Member
edited February 21 in Community Q&A

I want to simulate natural convection inside a cylinder. There is water and solid particles present inside the cylinder. How to simulate the system in simLab coupled with EDEM? Please suggest relevant tutorials.

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Answers

  • Prasad Avilala_20558
    Prasad Avilala_20558
    Altair Employee
    edited February 20

    Hi Rajani,

    Please follow the below steps to access the tutorial using EDEM+ Simlab 

    1)  Click on File--> Help-->Learning Centre , you will navigate to below page

    image

     

    2) Expand Multiphysics and select the below tutorial

    image

     

    Hope this helps to you.

     

    Thanks,

    Prasad A

  • Rajani Kant Baro
    Rajani Kant Baro Altair Community Member
    edited February 20

    Hi

    I have gone through these tutorials and I am able to reproduce the examples. But if I apply the same methodology for natural convection, some problems arise such as

    - unrealistic temperature

    -high velocity

    -particles appear just for 0.1 s and disappear suddenly

     

    Please suggest how to resolve these issues.

  • Stephen Cole
    Stephen Cole
    Altair Employee
    edited February 20
    Rajani Kant Baro said:

    Hi

    I have gone through these tutorials and I am able to reproduce the examples. But if I apply the same methodology for natural convection, some problems arise such as

    - unrealistic temperature

    -high velocity

    -particles appear just for 0.1 s and disappear suddenly

     

    Please suggest how to resolve these issues.

    Hi Rajani,

     

    These issues are typically time-step related.  EDEM calculates the Rayleigh time-step and we normally recommend running at 20% of this for stability.  AcuSolve will solve at a larger time-step but we have to consider the time-step ratio between the two programs.  Often the CFD time-step is OK within the range of 10-100 times larger than the EDEM one however the large ratios can lead to instabilities like you describe.  Reducing the ratio (reducing AcuSolve time-step) should resolve this.

     

    Time-step also detailed in the e-learning - https://learn.altair.com/course/view.php?id=176

     

    Regards

    Stephen

  • Rajani Kant Baro
    Rajani Kant Baro Altair Community Member
    edited February 21
    Stephen Cole_21117 said:

    Hi Rajani,

     

    These issues are typically time-step related.  EDEM calculates the Rayleigh time-step and we normally recommend running at 20% of this for stability.  AcuSolve will solve at a larger time-step but we have to consider the time-step ratio between the two programs.  Often the CFD time-step is OK within the range of 10-100 times larger than the EDEM one however the large ratios can lead to instabilities like you describe.  Reducing the ratio (reducing AcuSolve time-step) should resolve this.

     

    Time-step also detailed in the e-learning - https://learn.altair.com/course/view.php?id=176

     

    Regards

    Stephen

    Thank you for your suggestion. Now I am able to resolve the issue.

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