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Well it appears it may be a Mecway issue. I opened the STEP in Freecad and exported it. Now when it comes into MECWAY there are some holes that are "filled". I have attached this new STEP file. I will give V15 a try.
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@ehoule my STEP file was indeed exported from SolidWorks. I will try your "fix". Thanks for the quick response. Victor, I am using V14.0 and I have attached the STEP file.
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Hi John, Thanks for your help. When I looked at MECWAYs capabilities using CCX it says you cannot do centrifugal force when doing dynamic non-linear simulations. Is that simply a limit of the MECWAY interface and not of CCX? Will the custom comm…
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There appears to be a very small amount of nominal interference between the parts. Would not have noticed that without your help. Thank you.
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I made the gasket mesh quite fine and the orange lens mesh a bit finer as well. I also made sure the coarser orange lens was the master. Now the bonds look solid in linear mode. I am currently running in non-linear without the c3d errors. Thank y…
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Hi Sergio, What is the recommended method for generating that kind of mesh? The lens and the gasket are flat parts so they should lend themselves to other meshing methods.
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In the above picture blue is bonded to purple (gasket) which is bonded to orange (Acrylic lens)which overhangs the gasket by a good bit. Looks like it only attaches at a few select points.
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Well I am not out of the woods yet. When I run the symmetrical model in linear mode with CCX it fails: *ERROR in e_c3d: nonpositive jacobian determinant in element When I run it using the MECWAY solver, it solves, but the bonded contacts seem t…
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Great advice!! Ran the linear simulation and it turns out one of my bonded contacts had gotten "broken" in the process of trying to run down the other issues. That was a big help!
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Victor, I built the MKL version of CCX and ran that version on the model with symmetry. It runs much faster and did not fail on memory limit, but it failed to converge - it exceeded the number of cutbacks. I ran the full model (no symmetry) with a…
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OK. Thanks. I have 64GB of memory, but not sure if that helps CCX or not. I will look at going back to the symmetry model and also see if I can get the MKL version up and running. Probably worth the effort to have a higher capacity non-linear si…
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Hi Victor, my bonded surfaces are not the same size so, as you say, I think the warnings are not my issue. I am not using shell elements (at least not intentionally). Everything has been meshed from STEP files using Netgen. I can run the the flat…
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I unchecked quadratic elements and it seems to have meshed fine now. See attached picture. Thanks.
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It looks like it is confusing where the corners of the cells are. Any suggestions?
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Looks like 300K is the magic number, tried the high 300's with no luck. Dropped it below 300K and it appears to be iterating. Looks like CCX only uses about 5GB max for its computations. Curious as to why it is so limited in its model size. Is t…
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Is there a way to get something similar to the CCX contact type of interface with the internal solver? I looked at the compression only constraint, but that only took one surface as an argument so I wasn't sure how to use that in a mated surface co…
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Thank you Victor. I was wondering if that might be the case. How low would you suggest I try and get the node count?
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That would explain it. Thanks.
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the model has about 1.3M nodes and about 700,000 elements. The Mecway solver crashes with memory issues, though I have plenty of memory. In light of this I tried the CCX solver. It simply exits after some period of time with no messages other tha…
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Thank you Sergio. I made my model a bit smaller, but now I am getting an out of memory message after just a few minutes of running. I have 64GB of RAM so I am not sure why this is being thrown. I will look into the max memory options listed above…
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I cut the part in two with the cut line just 0.000001 inches from the problem area. There was no gap between the parts. Interestingly both parts meshed and then I bonded them back together. I can only guess at why this might have worked (problem …
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Vic and Sergio, your input is very helpful. I have Netgen 5 installed on my machine and I will see if some of the healing works. If not I think I can cut the model into two pieces that do not include the very tiny edge surface. I can then mesh th…
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Here is the model cleaned up a bit. Still doesn't mesh. Looking for a way to isolate cause of failure
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In looking at things closer, it appears that the STEP file has some faces that should be edges instead of faces. Not sure why my CAD program is generating those faces. I think they are most likely the problem. Is there a way to edit the faces so …
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Sergio, by adjusting the meshing parameters for each of the orientations of the blade I was able to get all 4 to mesh, so I am good to go. Thanks for being there to look at it.
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It seems to be an issue still. There are 4 blades to the rotor assembly. Some blades mesh, some don't the only difference is their orientation.
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If I increase my minimum number of elements per curve and increase the minimum number of elements per edge and then reduce my number of elements (Agressive) I can get it to mesh in the tilted orientation, but obviously at a lower meshing resolution.
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I should say that it is my guess that there are surface elements there still. I don't know that for sure
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Used the recommended method for both parts shown. Joined them with bonded contact. Made for a very clean mesh on a part that previously would not even mesh. Thanks again for the help.
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Thanks so much for the help. Greatly appreciated. Sergio, I had tried something similar to your method and got to work, but your method is superior. Thank you and thanks to VMH for the informative illustrations. Problem resolved.
