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Tomáš Marhan

  • Czech Republic
  • Since 2023
CFD, OpenFOAM, ...
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Solver iterations settings

Hi everyone,


In the latest version of TCAE (25.03v1), it is possible to set new parameters in the SIMULATION/Controls section: the solver max and min iterations (photo attached). What exactly do these iterations correspond to?


Thanks in advance.


CFD, OpenFOAM, ...
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Transient simulations

Hello everybody,


I have a few questions regarding TCAE transient simulations.


CAA - Acoustics
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DJI 9450 benchmark

I came across your report on the DJI 9450 and found it very interesting. I do have a few questions:

1. What is the source of the CAD file, and how did you determine the airfoil details?

TCAE Tech Support
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Residuals flattening out in centrifugal compressor impeller simulation

Hi everyone,

I’m running a steady-state simulation of a centrifugal compressor impeller and I keep running into an issue where the residuals settle but don’t properly converge, even after several thousand iterations. The solution...

CFD, OpenFOAM, ...
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CFD transient simulations parameters

Hello everybody, 


I am setting my first CFD transient simulation on a centrifugal compressor and I would like to know if you have any recommendations on the values of parameters like CFL number or PIMPLE algorithm settings. I assume that the default value of CFL number is relatively large (=20 hence >>1) because the PIMPLE algorithm is flexible and that's common to u...

General Discussion
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Asking for help solving Meshing Failed issues

Component 5, (Nacelle_Top) and Component 7 (Nacelle_Bottom) are experiencing failure to mesh. Can you take a look? It might be obvious to you.

Here's a download 

General Discussion
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Project setup has errors but cannot tell what or where

Working through the Check for Errors exercise finally presented only this orange border in the Components Map. Other than TCAE Output messages, there's no textual description of what or where things have gone awry. I'm assuming it's displayed somewhere in the TC...

General Discussion
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I am loving this!

Still working through the Check exercises. Narrowing the errors down (hopefully!).

CFD, OpenFOAM, ...
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Twin Centrifugal Fan Component Map

A common inlet at the top feeds two (identical) centrifugal fans. I tried to connect Top_System_inlet_interface (identical to but different in name as suction outlet interface) to serve double-duty as outlet interface to both the Top_Fan (rotating) AND Bottom_Fan (rotating).

It seemed that wasn't working so it occurred to me that connecting a copy of the object with another name might. Su...

CFD, OpenFOAM, ...
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Question about snappyHexMesh and cellZone generation in OpenFOAM v2012

CFD, OpenFOAM, ...
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I'm seeing two color bar legends in Reader View, one overlaying and obscuring the other.

After reimporting surface geometry, I see that the legend for the color bar in Reader View has multiple color bar legends superimposed. Can I, should I hide one or the other?

If so, how?


Thanks,


David

TCAE Tech Support
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NASA HECC Tutorial

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...

Meshing for CFD and FEA
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Problems with boundary layers on TMESH

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 quit...

Meshing for CFD and FEA
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Expansion ratio on TMESH

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

TCAE Tech Support
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Report Bug/Error: Forces are not rotated correctly in TCFD report but Coefficients

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...