July 20, 2019 at 9:43 amari003Subscriber
I currently faced a situation where I am unable to figure out the difference between Global and local element size.
Actually I am meshing it to use it in fluent and the body is 2D consisting of a single face( bounding domain with an airfoil). While I was specifying the element size, I was selecting the sizing option by right-clicking on the mesh, selecting the only surface and putting the value(0.008m) there and proceeding with the generate mesh. There I was skipping the Global element size which was made to default(0.205m). Now my doubt is which size will system consider for meshing and what if I put the Global and Local element size same value?
Will be very helpful if I get a response.
July 20, 2019 at 3:14 pmpeteroznewmanSubscriber
Local controls override Global controls.
Global controls apply to entities that have no other controls applied.
July 20, 2019 at 4:47 pmari003SubscriberI checked with both condition.
First without any local sizing(only Global) and then with local sizing.
In both case the aspect ratio and skewness obtained are different.
Any idea on this?
July 20, 2019 at 5:34 pmpeteroznewmanSubscriber
I expect a mesh with a .205 m size to have different aspect ratio and skewness than a mesh with a .008 m size on the same geometry. That fact is not interesting to me.
An interesting question is what mesh controls will create high quality elements on a given geometry, and how can that geometry be sliced to improve the element quality and get a good inflation layer on the boundary that is a wall.
July 20, 2019 at 6:17 pmari003SubscriberYou didnt get what I said in my previous comment though.
I tried first with Global element size as 0.008 and then in my second attempt I have given a local element size as 0.008 and kept the global element size as default. As u said that the local will override which happened in the second case but the mesh quality (aspect ratio and skewness) changed which I didnt expect.
July 21, 2019 at 1:39 ampeteroznewmanSubscriber
You applied a size control to a face, but there are edges too. What happens if you assign a local size control to all the edges as a second control? I don't know what to expect, but I don't care either. I just use the mesh controls to get good quality elements.
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