Flow not connected across mesh interface

antikodo · May 13, 2020, 08:01

I am a beginner to fluent, trying to perform 2D-VAWT analysis. I have built a simple 2 blades Savonius rotor rotating 668.5rpm in 7m/s flow. The velocity contour of the result seems there are 2 different flows, across the interface between rotor and ambient airflow.
But the pressure contour is perfectly fine.

I have no idea what causes this, I have tried to solve this for few days already still getting this result, please help.

Velocity Contour:
https://ibb.co/CVBzdMz

Pressure Contour:
https://ibb.co/0VJqfP7

vinerm · May 14, 2020, 07:52

How are the rotating and stationary zones communicating with each other? Are you using Mesh Interfaces? If you are using Frame Motion and Mesh Interfaces, then I'd suggest you to use conformal mesh for improved accuracy. However, if you are using Mesh Motion instead of Frame Motion, then Mesh Interfaces are required but the results in that case are not good. So, most likely it is the former that you are doing. I'd recommend, change to conformal mesh.

May 13, 2020, 08:01	Flow not connected across mesh interface	#1
antikodo New Member Wong Seik Tai Join Date: May 2020 Posts: 1 Rep Power: 0	I am a beginner to fluent, trying to perform 2D-VAWT analysis. I have built a simple 2 blades Savonius rotor rotating 668.5rpm in 7m/s flow. The velocity contour of the result seems there are 2 different flows, across the interface between rotor and ambient airflow. But the pressure contour is perfectly fine. I have no idea what causes this, I have tried to solve this for few days already still getting this result, please help. Velocity Contour: https://ibb.co/CVBzdMz Pressure Contour: https://ibb.co/0VJqfP7 Last edited by antikodo; May 13, 2020 at 08:02. Reason: image not showing up

May 14, 2020, 07:52	Communication	#2
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 35	How are the rotating and stationary zones communicating with each other? Are you using Mesh Interfaces? If you are using Frame Motion and Mesh Interfaces, then I'd suggest you to use conformal mesh for improved accuracy. However, if you are using Mesh Motion instead of Frame Motion, then Mesh Interfaces are required but the results in that case are not good. So, most likely it is the former that you are doing. I'd recommend, change to conformal mesh. __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

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