Natural Convection in enclosed container with EDEM particles

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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SimLab

v2022.3

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PrasadAvilala

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

2) Expand Multiphysics and select the below tutorial

Hope this helps to you.

Thanks,

Prasad A

Rajani Kant Baro

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

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

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.