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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.
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
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 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.
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
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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