Quick and dirty introduction to overset meshes in OpenFOAM-V2312
Ғылым және технология
🤯 The main takeaway of this video is the introduction of new options used to control the chimera hole.
😎 We also briefly introduce overset meshes, quickly explore the input files, and run a simple static case using overset meshes in OpenFOAM-V2312.
🤔Overset meshes (OM) are also known as overlapping grids, overset composite grids, composite overlapping meshes, chimera meshes, patches grids, composite grids, relaxed multi-block meshes.
The overset capabilities demonstrated in this video tutorial are only available in the OpenFOAM ESI version (www.openfoam.com).
Case files:
bit.ly/3H8WhuT
Slides:
bit.ly/48oVXEy
🫡 Old playlist. This was back in 2019 - Pre-pandemic times fellas!
• Overset meshes with Op...
🥳 Stay tuned as we are working on a new playlist using the latest version of OpenFOAM ESI and Ansys Fluent.
Chapters:
00:00 Introduction
00:41 What are overset meshes?
03:41 Development timeline of overset meshes
06:17 Incomplete list of overset solvers and libraries
08:11 Overset meshes in OpenFOAM
14:52 Overset meshes in action - A few simple applications
17:56 Best improvement in OpenFOAM ESI - Not only related to overset meshes
18:51 Let's run a simple tutorial - Flow about a static cylinder
21:23 Let's generate the overset mesh assembly
22:19 Let's visualize the overset mesh assembly
24:00 Let's compute/visualize the cell type - Let's explore the input files
38:07 Let's compute different chimera holes
40:35 Benchmarking information
44:09 Plotting the solution with Gnuplot
48:04 Let's run the overset mesh case - Extra remarks
51:33 Let's run the single block mesh case
52:35 How to post-process overset mesh solutions
56:16 Main takeaways - Final remarks
Useful links:
Chimera hole optimization options (kind of):
www.openfoam.com/news/main-ne...
Release of overset solvers:
www.openfoam.com/news/main-ne...
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Пікірлер: 7
thanks for sharing
Could this be used to simulate a mooring analysis of a set of buoys under the flow of a river? lets say, 3 buoys moored between then with each one on each extremity tied to a point outside the fluid.
@wolfdynamics5703
6 ай бұрын
Yes, but you need to install the mooring model.
I'm currently modelling a flow around a cylinder near the seabed, i built such a mesh for a cylinder that the lower part is sticking out of the bottom boundary, so when parameters discussed somewhere in 25:00 were set to more than 4/1, it created a huge area of hole cells and the visual representation looked very ugly. Sometimes this feature could be not useful.
@wolfdynamics5703
3 ай бұрын
Well, I will need to take a look at the case to know what is the issue. But if it is only a visual representation it shouldn't be a problem. Keep in mind that you also need enough cells to carve a good chimera hole.
Bro, I notice that in OpenFoam V2312, the layering in SnappyHexMesh can be improved drastically by introducing meshShrinker. I have already tried that tutorial but it does not work. Could you please share that too if it is alright for you?
@wolfdynamics5703
6 ай бұрын
Well, I have mixed feelings regarding that. Pretty much those are small patches that do not work. I do not know why the developers haven't addressed this issue which is related to ratio of surface area to first cell center. I have a method to overcome that issue but it is kind of our secret. but in few words, just increase the maximum aspect ratio (the one hardwired in OpenFOAM) from a 1000 to 10000 or something bigger, and that will improve the BL meshing.