[CIG-SHORT] Mesh interpenetration
Li, Teng
tengli2 at illinois.edu
Wed Nov 1 12:47:15 PDT 2017
Hi Matt,
Thanks. I will further study this.
Best,
Teng
Teng Li
Master Candidate in Structures
Department of Civil and Environmental Engineering
University of Illinois at Urbana-Champaign
205 North Mathews Ave, Urbana, IL. 61801
Phone:(217)8196210, Email: tengli2 at illinois.edu
________________________________
From: CIG-SHORT [cig-short-bounces at geodynamics.org] on behalf of Matthew Knepley [knepley at rice.edu]
Sent: Wednesday, November 01, 2017 10:29 AM
To: cig-short at geodynamics.org
Subject: Re: [CIG-SHORT] Mesh interpenetration
Oh, that is not right. Either there is a bug, or the displacements are being misinterpreted.
Matt
On Wed, Nov 1, 2017 at 11:06 AM, Li, Teng <tengli2 at illinois.edu<mailto:tengli2 at illinois.edu>> wrote:
Hi Matt,
Please find the attachment which is the original mesh in the area where the left 60 degrees secondary fault link directly to the main fault. Two faults are highlighted. As we can see, all the mesh in this area is quad mesh. The reason why we see the triangular mesh in the left part is just that some meshes overlap each other. And according to my observation, part of the cells along the secondary fault on the right go into the cells along the secondary fault on the left part.
Because the left 60-degree secondary fault link directly to the main fault, there will be a sharp triangular in the junction area. I choose 12.5m mesh size and use Trellis to mesh this area. And please find the new attachment for the mesh information in this junction triangular area. If this mesh is in a bad quality, what might be the solution? Can I use smaller mesh size?
Thanks.
Best,
Teng
Teng Li
Master Candidate in Structures
Department of Civil and Environmental Engineering
University of Illinois at Urbana-Champaign
205 North Mathews Ave, Urbana, IL. 61801
Phone:(217)8196210<tel:(217)%20819-6210>, Email: tengli2 at illinois.edu<mailto:tengli2 at illinois.edu>
________________________________
From: CIG-SHORT [cig-short-bounces at geodynamics.org<mailto:cig-short-bounces at geodynamics.org>] on behalf of Matthew Knepley [knepley at rice.edu<mailto:knepley at rice.edu>]
Sent: Wednesday, November 01, 2017 3:14 AM
To: cig-short at geodynamics.org<mailto:cig-short at geodynamics.org>
Subject: Re: [CIG-SHORT] Mesh interpenetration
On Wed, Nov 1, 2017 at 12:05 AM, Li, Teng <tengli2 at illinois.edu<mailto:tengli2 at illinois.edu>> wrote:
Hi,
Please see the attached picture which shows the junction of the secondary fault and the main fault. I used paraview to visualize the vtk file. In the paraview, I used wrap by vector filter to show the displacement of the junction. As we can see, it seems interpenetration occurs in this area. And two faces separate from each other. I wonder whether this is a valid result? And if it is not right, what might be the reason? Thanks.
1) I do not understand why there are two triangles in the picture. Isn't this an all quad mesh?
2) If the fault is in tension, it will open. I am not sure why you would call that interpenetration, which means that two quads cross over each other, not leave a void.
You might increase the cohension at that interface if you want it to remain together, or look at the normal stress on the fault, which should ordinarily be more
than enough to keep it together.
3) The extremely narrow quads on the right are bad for your system condition number. Why did you mesh it that way?
Thanks,
Matt
Best,
Teng
Teng Li
Master Candidate in Structures
Department of Civil and Environmental Engineering
University of Illinois at Urbana-Champaign
205 North Mathews Ave, Urbana, IL. 61801
Phone:(217)8196210<tel:(217)%20819-6210>, Email: tengli2 at illinois.edu<mailto:tengli2 at illinois.edu>
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