Hi, wanted to do Drivaer estate simulation with rotating wheels, moving ground. So i started with tutorial from website, and used the same configuration as starting point, and Cd was way to low, then i changed to Kepsilon back and forth Cd was still low. then i switched to half of car and started to refine mesh and Cd went little higher to 0.3 but still it is inacurate, then refined further and Cd ramped to 0.38 then started to look on Y+ and further refined to achieve average 5, but most of car is 2, and still Cd is very high (0.37), tried also with LowRe wall functions but it seems that Cd is still too high. Any Ideas what to check/ to replicate good- consistent results? Experimental CD for estate is 0.314

Hello everyone, 

I have a recurrent problem when meshing with SnappyHexMesh: there are "holes" on some boundaries of my mesh (see picture). Do you know why this is happening? And what could I change to have a mesh that perfectly match with my geometry? I am working on a passage of a centrifugal compressor. 

Thank you in advance !

Alex 

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I am running the Ahmed benchmark case downloaded from cfdsupport, and I get a different drag coefficient compared to what is in the report on the website (experimental value: 0.2850, website value 0.2848, my value 0.305). This is a fairly significant difference. I am using the files exactly as downloaded, in TCAE-Lite version 25.10. What would be the reason for this difference in drag prediction?

Hello,

I am interested in the Axial Fan TCAD geometry builder mentioned in this example:
https://www.cfdsupport.com/axial-fan-design-and-simulation/

Can someone in the forum clarify whether the TCAE-Lite version provides access to this geometry builder, or if the full TCAE package is required?

Thank you for your help!

Daniel Garcia

I have a pre-built mesh in cgns format which consists of a half-wing, symmetry plane and a half-sphere as the outer boundary. I can successfully import the mesh into TCAE-Lite. I want to set the half-sphere up with a freestream boundary condition (so that it can act as inlet and outlet), but there seems to be no option for this. Is there any way to run this type of geometry in TCAE-Lite, or do I need to physically split the half-sphere boundary into an inlet and outlet portion? Note that it is important that the volumetric mesh is kept as-is (the intention of this work is to look at results from different codes using the same mesh).

Hello everyone,

I have trouble initializing a case using a previous result when I try to run a simulation with the remote computing strategy described in Chapter 7 of the TCAE manual. The graphical interface doesn't allow me to select the source case from the remote machine's files. However, I can do this without any problem when running the same case locally.

Is there a specific procedure for doing this remotely, or is this a bug?

Thanks in advance!

Zacharie

Hi everyone,

It seems to me that the field bounding limits are only applied in stationary simulations, and not in transient simulations. Indeed, in one of my transient tests, many cells of my domain reach values (the velocity in my case) well above the max velocity indicated in SIMULATION/Controls.

Are you aware of this comportment ?

Thanks in advance !

Zacharie

Hello everyone,

I have some questions regarding case initialization:

1) In steady-state simulations, I assume that the conditions defined in the "Initial Conditions" section are only used to initialize the first point of each speedline, and that subsequent points are then initialized from the previously calculated point in the speedline. Is that correct?

2) In transient cases, a new option appears in the "Initial Conditions" section: "Initialize points from the previous point." What happens if this option is not selected? Is each point then initialized with the conditions defined in this section, regardless of its position in the current speedline?

3) Do you recommend simulating the speedline from the highest flow rate to the lowest flow rate, or the other way around (in the case of a centrifugal compressor for example) ?

Thanks in advance!

Zacharie

Hi everybody, 

I ran a steady state + transient CFD simulation on a centrifugal compressor (with a k-omega SST model) and when post-processing the results and comparing the stationary part to the unsteady part of the calculation I have significantly different results. Indeed, the unsteady part shows a higher mass flow rate. This seems to be due to a higher flow speed and a different flow angle, noticeable directly at the inlet of the rotor. On the picture attached you see these differences (on the left: unsteady part; on the right: steady state part). Is it possible that this difference in flow rate could be explained by the fact that the dynamic mesh in the unsteady part could aspire the flow in the rotor and thus change the angle and speed of this one? And maybe this effect could have been lower if I would have set a lower CFL (kept for now to 20 in my case)? 

If you have any ideas about this phenomenon that would be very helpful. 

Thanks and have a great day,

Alex 

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.

Zacharie Prigent

Hello everybody,

I have a few questions regarding TCAE transient simulations.

1) Are the transient simulations robust?

2) Do you have any recommendations for applying transient simulations  to centrifugal compressors?

3) How do I control the recording of intermediate time steps? I haven't found a way to control it in the GUI, and the controlDict file in ../system/ is automatically restored to its previous version (with the adjustableOnEnd option in the writeControl section), even if we manually modified it before running the calculation!

Zacharie Prigent

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?

• 2. Why did you choose to compare the results with a full quadcopter instead of isolated rotor data, which is also available?

• 3. It would also be interesting to see an OASPL comparison to evaluate how well your tool predicts rotor noise. the shape of the PSD is important but OASPL is the final objective.

  
  

  Thanks!

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 looks stuck, and I’d like to understand if the problem is with my setup, mesh, or solver controls.

Case setup

• Geometry: Centrifugal compressor impeller with inlet passage and outlet

• Mesh: ~1.6 million cells, generated in TurboGrid and exported as cgns into TCAE

• Interfaces: Mixing plane, 7 mixing planes total across 2 interfaces

• Fluid: Air, perfect gas; μ = 1.78e-5, ρ = 1.2, p = 1 atm (defaults)

• Rotation: 110,000 RPM (tested both +111000 and −111000, same behavior)

• Flow regime: Transonic option enabled

Boundary conditions

• Inlet:

  • Total pressure = 1 atm

  • Total temperature = 288.15 K

  • Turbulence intensity = 5% (k = 82.14)

  • Turbulence length scale = 0.015 m (blade height) → ω = 604.207

• Outlet:

  • Mass flow = 0.35 kg/s

• Walls: No-slip, adiabatic, standard wall functions

Solver settings

• Turbulence model: k-ω SST (default values)

• Numerics: Second order, non-orthogonal mesh correction enabled

• Under-relaxation factors: Set to 0.15 (started higher but reduced due to stability issues)

• Physical limits:

  • p: 50,000 – 800,000 Pa

  • ρ: 0.1 – 100

  • v: 0 – 800 m/s

  • T: 250 – 700 K

• Initial conditions:

  • p = 1 atm

  • T = 288.15 K

    v = 0 , 0, 148 Got it from a 1D code as the absolute velocity at the inlet.

  • k = 0.01

  • ω = 100

Problem

Residuals drop initially but then flatten out and refuse to converge further. Monitors also don’t stabilize in a meaningful way, I think the monitors get stuck because the residuals do not drop further. I have tried with the fixed mean static pressure outlet condition as well but still the same thing. One thing I suspect is that I think there maybe be some unsteadiness in the flow which maybe causing this, is there a way to set a pseudo time scale or something. Any help would be appreciated!