dynamic mesh + inflation layers

Albino · February 17, 2014, 05:04

Hi,

I am trying to model vortex induced vibrations, although with flow that passes over two cylinders. 2D model.

I have not been able to get inflation layers to work with dynamic mesh for the moving cylinder. I can have them for the stationary cylinder without issues, however as soon as I use them for the moving cylinder I get "dynamic mesh failed - negative volume" error after some iterations.

Watching the mesh after this error shows the model (or the mesh) having "gone into itself".

My question is; How do i use inflation layers with a moving object? The cylinder is allowed to move in both X and Y directions (no rotations though).

I have tried smoothing, layering and remeshing - none is working for me. Am I missing something?

Reason I want inflation layers is to have y+ of 1. I use k-omega SST and want to capture seperation properly (Re = around 1.5e6, critical).

Any tips, feedback and comments are welcome.

Thanks!

stumpy · February 18, 2014, 12:21

Try version 15.0 (which switched to node based smoothing) and use the "Deform Adjacent Boundary Layer with Zone" option.

Albino · February 19, 2014, 07:47

That sounds like exactly what I need. Too bad my school only offers v14.5 of Fluent.

Thanks for the respons though!

sfotovati · May 15, 2014, 14:59

Here is what to do. slice your geometry in such a way you can make mapped faces for your mesh generation. set the number of mesh on edges to cover the exact size you wanted the inflation does. now in Fluent set the dynamic mesh with layering, and it will work for you.

good luck

February 17, 2014, 05:04	dynamic mesh + inflation layers	#1
Albino New Member Join Date: Oct 2013 Posts: 7 Rep Power: 13	Hi, I am trying to model vortex induced vibrations, although with flow that passes over two cylinders. 2D model. I have not been able to get inflation layers to work with dynamic mesh for the moving cylinder. I can have them for the stationary cylinder without issues, however as soon as I use them for the moving cylinder I get "dynamic mesh failed - negative volume" error after some iterations. Watching the mesh after this error shows the model (or the mesh) having "gone into itself". My question is; How do i use inflation layers with a moving object? The cylinder is allowed to move in both X and Y directions (no rotations though). I have tried smoothing, layering and remeshing - none is working for me. Am I missing something? Reason I want inflation layers is to have y+ of 1. I use k-omega SST and want to capture seperation properly (Re = around 1.5e6, critical). Any tips, feedback and comments are welcome. Thanks!

May 15, 2014, 14:59	use mapped mesh + layering	#4
sfotovati Member Shawn Fotovati Join Date: Jul 2009 Location: Dallas, TX Posts: 42 Rep Power: 17	Here is what to do. slice your geometry in such a way you can make mapped faces for your mesh generation. set the number of mesh on edges to cover the exact size you wanted the inflation does. now in Fluent set the dynamic mesh with layering, and it will work for you. good luck

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February 18, 2014, 12:21		#2
stumpy Senior Member Join Date: Apr 2009 Posts: 531 Rep Power: 21	Try version 15.0 (which switched to node based smoothing) and use the "Deform Adjacent Boundary Layer with Zone" option.

February 19, 2014, 07:47		#3
Albino New Member Join Date: Oct 2013 Posts: 7 Rep Power: 13	That sounds like exactly what I need. Too bad my school only offers v14.5 of Fluent. Thanks for the respons though!