I'm not wanting to re-import geometry, although that's most certainly what I'm preparing for at the moment. All the STLs were created using the _ExportWithOrigin command with World origin as basepoint in Rhino, so I'm scratching my head, as usual. Importing the offending object back into a "top" drawing, an assembly-of-all-parts model, and aligning it to it's exact position, then re-exporting it and replace the file having the wrong origin is what I'll try next.

Is there any easy way to manipulate objects once they've been imported?

Please see my comment, button at bottom right. Thanks.

Mesh for component 1 was created incorrectly.

The patch(es) "1:Part_Studio_1_-_Outlet" has/have not been found in just created mesh.

There might be two reasons for that:

- Either the patch is so small, so the it was not possible to properly mesh it.

Check the patch visually, and also its meshing parameters.

- Second reason might be, that this patch is located outside the meshed geometry, and therefore cannot be meshed.

Again check the patch visually.

CFD meshing failed

I originally had this error on the Inlet patch, I don't know what I changed to correct that (nothing I believe)

The patch is not small, it appears water tight. It comes from a watertight model.

The patch is within the meshed geometry.

I've not had this error before, I've not struggled with meshing previously.

Hello everyone,

I’m currently working on a thrust ball bearing simulation using Abaqus (implicit dynamics), and I’m encountering significant oscillations in the contact force (CFNM). I’d like to ask for advice on how to reduce or eliminate these oscillations.

🔧 Model Overview:

• Analysis type: Implicit dynamic analysis

• Simulation time: 0.01 second

• Material: All parts are steel with elastic–plastic behavior and I add some density + damping

• Ball settings: The balls are modeled as rigid bodies

• Contact pair: Balls and inner ring

• Contact formulation:

  • Surface-to-surface

  • Hard contact (normal behavior)

  • Friction coefficient: 0.2

  • Contact damping factor: 0.2

📌 Boundary and Loading Conditions:

• The balls rotate around the inner raceway (orbital motion)

• Each ball is subjected to a vertical force (toward the race)

• The raceway is fully fixed at the bottom

• Due to friction, the balls also spin around their own axes

❗ The Problem:

The CFNM (contact force in the normal direction) shows strong oscillations throughout the simulation. This instability leads to unreliable force results and makes it difficult to extract meaningful physical insights (see example plots below if needed).

✅ What I’ve Tried:

• Using soft contact (reduced oscillations, but I need to retain stiffness accuracy → hard contact is necessary)

• Applying smoothed initial loading using amplitude curves

• Mesh refinement in the contact area

• Adjusting contact damping (set to 0.2)

Unfortunately, none of these methods sufficiently reduced the oscillations.

❓ Questions:

1. Are there more effective ways to reduce or suppress contact force oscillations in implicit dynamic simulations?

2. Is my current contact damping value (0.2) too high or too low? Any empirical guidance?

Any advice, suggestions, or experience sharing would be greatly appreciated. I’m happy to provide figures or portions of the input file if helpful.

Thanks in advance!

is it possible with TCAE to make “overmesh” meshes?

Hi All,

New user here. I've gone through the tutorials and forum but haven't found my answer. Asking the AI chat bot it says I need to do some scripting and change some files, which I don't believe. I feel the answer is more straight forward.

How do I measure the mass flow rate through my system? You can set the units for the report, but my report shows nothing of the sort. I'm sure there must be something simple like a button to calculate this?

Hi,

I have a problem with report at the end?

Program made all 3000 iteration ( about 1.200.000 pcs), but at the end is allways problem with the report: (see picture below).

Thanks.

Hi,

I have a problem with report at the end?

Program made all 3000 iteration ( about 1.200.000 pcs), but at the end is allways problem with the report: (see picture below).

Thanks.

I have been trying to run the the NASA HECC tutorial provided by TCAE. The tutorial has a very dense mesh and takes verylong to run and make a speedline. In order to save computation time I tried two methods:

1. I reduced the mesh and ran the simulation for only one point on the speedline (the one with the highest efficiency). 

2. I ran the whole tutorial as is and just skipped the first two points 

Both methods do not result in convergence at all. I am not sure what is going wrong. I have tried to adjust the relaxation factors annd still nothing works to get convergence.

What can i do to fix this?

Hello again, 

I was wondering also if boundary layers are mandatory to capture precisely the turbulence near the walls or if a good refinement can be satisfying? As soon as my geometry is getting complex, my boundary layers start to collapse at certain locations on the walls

I am using a k-omega SST model with a standard wall function, so my simulation should be quite flexible with y+

Thank you

Alex

Hello everyone,

I am currently trying to reduce my number of cells on my mesh and I was wondering how to implement and control an expansion ratio on TMESH? to have a coarse mesh that becomes thinner linearly along a pipe for example

Thanks

Hi,

I'm a new user of TCAE-Lite.

I've setup a pump case and the "check" button says the case has been setup correctly. However it fails to mesh.

The same error occurs when running the f1 tutorial case.

Any advice would be appreciated,

Thanks,

Tom

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Hello,

I found you have changed the Spitfire TCFD example few versions ago so as it applies 1.5AoA - or -1.5 It does not matter actually in this scope - by rotating velocity vector and aiming to get it rotated as expected by setting forces axes rotated in Runtime evaluated quantities, so this should apply to the final report. I've simplified the example - to get faster results - and found that in the report forces are never rotated as expected despite that Coefficients are rotated, you can test this by changing the Forces in Runtime evaluated quantities to 0,0,1,1,0,0 in the example and see that only Coefficients are changed in the report.

Tested on TCAE 25.03v1

https://www.cfdsupport.com/cae-open-source-software.html

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Please contact us if you find new open-source software to complete this list or broken link or any inaccuracy. We’ll be happy to fix it.

May you have any questions, don’t hesitate to get in touch with us.

Best Regards,

Team CFD SUPPORT