April 2, 2018 at 5:49 pmJpra93Subscriber
Hello, I'm in process to simulate a Michael Banki turbine with ansys fluent, I made a sketch (2D) to simulate the profile of the turbine, but when I run the calculation, its stop and show the message "Negative Cell Volume detected", I read about it, and I think that can be the remeshing process but dont be sure.
April 2, 2018 at 9:34 pmJpra93Subscriber
now I'm triying to simulate another form, with a rectangular domain, but even with those geometry i have the same problem that before, i found that the domain is the problem, on the dynamic mesh i set with the deforming type zone, i dont know what can i do to sovle the problem, please help!!!, i put a image of the problem.
April 3, 2018 at 7:35 pmraul.raghavSubscriber
Did you try using a lower timestep? Negative volumes are usually caused due to a larger timestep or tight smoothing criteria. Did you look into these points?
April 7, 2018 at 10:48 amRaef.KobeissiSubscriber
When it comes to dynamic meshing I found that tetrahedral meshing is better than hexahedral mesh especially in avoiding negative cell volumens.
April 9, 2018 at 8:10 pmJpra93Subscriber
yes , I did that, but i cant decrease more the timestep because the iteration process take to much time and never end.
April 9, 2018 at 8:13 pmJpra93Subscriber
I used hexaedral and tetrahedral mesh. but in both cases the mesh fail.
April 11, 2018 at 2:20 pmraul.raghavSubscriber
Could you attach the workbench archive file here so that we could take a look at the settings? If you're not sure how to archive the workbench file, check: saving and sharing workbench archive file
April 12, 2018 at 8:57 pmJpra93Subscriber
Here it's the file, thanks for the help.
April 14, 2018 at 9:29 amRaef.KobeissiSubscriber
I checked your case and it is set up incorrectly. I recommend you to use the Sliding mesh method instead of dynamic mesh for this particular simulation. Check my tutorial:
April 15, 2018 at 7:58 pmJpra93Subscriber
But on the Sliding mesh method, speed is a know parameter, and i have to obtain this parameter to calculate the power generated by the turbine, how can i do that?, it's appropiate use the sliding mesh method on this case?. thanks.
October 10, 2018 at 2:02 pmAparnaSubscriber
I am also getting negative cell volume error for scroll expander simulation. i couldn't solve it. kindly help me. there is no option for sliding mesh method.
October 10, 2018 at 2:54 pmRobAnsys Employee
You'll need to separate (and not connected) fluid regions. If the cells are connected over the sliding interface it'll do something interesting with the mesh.
October 10, 2018 at 3:15 pmAparnaSubscriber
differentiated them at the time of modelling. still im getting the error. i could identify the error location but couldn't correct them. how to correct them.
October 10, 2018 at 4:35 pmRobAnsys Employee
Sorry, I'm not sure what you mean by that. You will need two zones (stationary & rotating) as per the tutorial. Can you check the mesh quality in Meshing just incase that's where the problem is?
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