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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Hi! I'm a beginner CFD user, and I've encountered a strange bug with my mesh. When I reduce the firstLayerThickness to a smaller value, the mesh stops working. The layer doesn't generate properly, and I get an error saying my refineBox isn't inside my blockMesh, which is incorrect.

Hi everyone,

I woud like to export the relative velocity URel magnitude, instead of the absolute velocity U magnitude, in the interfaces files created by TCAE in ../stationnary/postProcessing/interfaceName/0/interfaces.csv. I tried to change the file ./stationnary/system/interfaces. fun by replacing magU by magURel in the list of fields per interface but it did'nt work... How can I do it ?

Thanks in advance !

Zacharie Prigent

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I am looking to simulate the power output of an in pipe axial turbine, I don't have any experience in CFD simulations and I've decided to brake down the project into 3 parts, first I am going to simulate just the pipe in which the turbine is going to be housed, then a static state with the turbine in the pipe, and finally setup the rotation of the turbine.

I've made a quick 3D model of the pipe and I tried copying the setup from the pipe example, I ran into a problem where the mesher consumes all the available RAM on the computer and locks it up, I assume the STL mesh has a hole somewhere but I couldn't find it, I've had issues before with glitches in STL meshes made in Rhinoceros 3D, the modeling program I used, so I decided to recreate the pipe example with the STLs from the example, and that meshed successfully, but I got an error in the TCFD part "TCFD calculation failed. Please consult the chapter 'Rescue list' in the TCAE Manual for possible reasons of the failure.", I couldn't find the Rescue list chapter in the manual online.

Also the TCAE Output gives this error:
"Application decomposePar failed.
For detailed information check error log at: "C:\Users\Name\Desktop\CFD Test\CFD_test\simulationRun1\TCFD\logRun\solve-err-decomposePar-stationary-1.log"".

And in that log file is:
"--> FOAM FATAL IO ERROR:
Cannot find patchField entry for Co1_pipe-wall_wall

file: C:/Users/Name/Desktop/CFD Test/CFD_test/simulationRun1/TCFD/stationary/0/nut/boundaryField from line 32 to line 54.

    From function void Foam::GeometricField<Type, PatchField, GeoMesh>::Boundary::readField(const Foam::DimensionedField<TypeR, GeoMesh>&, const Foam::dictionary&) [with Type = double; PatchField = Foam::fvPatchField; GeoMesh = Foam::volMesh]
    in file /opt/OpenFOAM-dev/src/OpenFOAM/lnInclude/GeometricBoundaryField.C at line 184.

FOAM exiting"

Attached is a rough diagram of how will the setup work.

I don't have an idea what to try next, and would be thankful for any assistance.

I have just installed v24.10 of TCAE-Lite. Initially I installed under Linux, sicne that is where I would really like to use the software. Having downloaded the pipe tutorial I load the case and get this message "Project configuration not fully valid according to TCAE-Lite 24.10 and may have been auto-corrected." When I try to run, I get a message that the caluclation cannot be started, and that the project contains some problems. Upon using the check option, it says that there is no geometry loaded for solid component 1. The stl file does exist in commonData\TMESH\imported and I can load it into ParaView with no issues.

So I then tried installing under Windows. In this case it does not complain about the geometry. However, when I try to run I still get a failure, which is "Failed to execute "netgenSTLMesh" (error 2)." It asks me to check an error log (mesh-err-07-netgenMesh-component1.log), but this file does not exist (there is no netgenmesh log file, and the mesh-err-07 file is called mesh-err-07-mergeMultiMeshes.log.

Can anyone provide details as to why the FEA meshing fails under Windows, and why the geometry does not work under Linux?

Hi Foamers, 

Based on the given instructions underneath, I have been able to come up with this design. Could you help confirm if the attached image to this topic looks promising or requires some modifications? Thanks 😊 

“Introduction

Finishing a small meshing task is the first possibility multi-block mesh using the blockMesh utility or Salome,

e. The task, creation of a small

Geometry

wall

outlet

cut

inlet

Z

Parameters d=50.8 mm

I=508 mm a=12.7 mm

= a/2

Description

The geometry represents half of the 2" pipe inner volume. It is composed of four building blocks. The first block (No. 1) represents the core of the pipe. The other blocks (No. 2, 3, and 4) fill the outside pipe volume.

The mesh blocks must be split by more than one cell in every direction. You can select how many cells you want to use. Apply the mesh grading, if possible.

The outside volume surfaces are called inlet, outlet, wall, and cut. Select an appropriate patch type for each surface.

The blockMesh utility writes out a log. Ensure no errors are reported.

Hint: The local coordinate system in each block should be aligned with the global coordinate system!”

I ma trying to create a thin boundary layer, to achieve a yplus <1 and I need the first cell to be positioned at 10^-5 from the wall of my 3D airfoil. I created the mesh using blockmesh and now I want to use snappyhexmesh only the add layer function.However when I do this snappyhexmesh does not generate the boundary layer. Thank you

Nicolas