- #1
pathak5
- 3
- 0
Hey guys, new user here.
I had a question about a project I am working on with a professor. Unfortunately he does not have much experience with fluent but is a very intelligent and experienced person when it comes to the theory.
So I am basically trying to develop a chart of the power factor of a VAWT for different angular velocities. My inlet velocity is at 25m/s(i know this is huge...but it's just a number i picked randomly to build the model).
Now I created in my mesh a separate interior zone of fluid in a circle around the blades that has a finer mesh than the rest of the 2d model.
I have read a few papers and some people have modeled for various application in such a manner that they created a rotating reference frame around the blades and modeled the blades (wall) as a rotating wall with 0 rad/s, but because it is adjacent to the reference frame it will rotate too theoretically. But obviously since the mesh is stationary, nothing is moving except the fluid. Now according to papers this is an acceptable assumption. I have gotten my power factor values for this for various speeds. Obviously they were high due to the inlet velocity but nonetheless my numerical model was created.
Now, I have investigated more, and I want to make the blades move, and animate it and so on. So I modeled the fluid section as a moving mesh and put in the dynamic mesh condition.
I keep crashing and having errors of "negative volumes" . I have found few items online to fix this erroneus function, but I am having absolutely no success.
Can someone help me here? What am I doing wrong? What else should I do? Do I have to create a user defined function program?
If any serious users want to help I am willing to show/send my case and data file if needed, but please no spammers. If sufficient help is provided I will attach person as co-author in the paper. I have msn, please let me know if it would be better to communicate there.
Any form of help is appreciated.
Thank you
regards
Joy
I had a question about a project I am working on with a professor. Unfortunately he does not have much experience with fluent but is a very intelligent and experienced person when it comes to the theory.
So I am basically trying to develop a chart of the power factor of a VAWT for different angular velocities. My inlet velocity is at 25m/s(i know this is huge...but it's just a number i picked randomly to build the model).
Now I created in my mesh a separate interior zone of fluid in a circle around the blades that has a finer mesh than the rest of the 2d model.
I have read a few papers and some people have modeled for various application in such a manner that they created a rotating reference frame around the blades and modeled the blades (wall) as a rotating wall with 0 rad/s, but because it is adjacent to the reference frame it will rotate too theoretically. But obviously since the mesh is stationary, nothing is moving except the fluid. Now according to papers this is an acceptable assumption. I have gotten my power factor values for this for various speeds. Obviously they were high due to the inlet velocity but nonetheless my numerical model was created.
Now, I have investigated more, and I want to make the blades move, and animate it and so on. So I modeled the fluid section as a moving mesh and put in the dynamic mesh condition.
I keep crashing and having errors of "negative volumes" . I have found few items online to fix this erroneus function, but I am having absolutely no success.
Can someone help me here? What am I doing wrong? What else should I do? Do I have to create a user defined function program?
If any serious users want to help I am willing to show/send my case and data file if needed, but please no spammers. If sufficient help is provided I will attach person as co-author in the paper. I have msn, please let me know if it would be better to communicate there.
Any form of help is appreciated.
Thank you
regards
Joy