Week 3 Challenge : CFD meshing on Turbocharger

Week 3 Challenge : CFD meshing on Turbocharger:-

Aim:-

(i) To check for the geometrical errors and perform Topology cleanup accordingly,and to perform surface mesh with the given target lengths as per PIDs.

1. Blade stage-1 = 1 mm
2. Blade stage-2 = 1 mm
3. Impeller = 2 mm
4. Shaft rotor = 1 mm
5. Turbo casing = 5 mm
6. Compressor casing = 5 mm
7. Inlet casing cover = 5 mm

(ii) To perform Volumetric mesh for the required volumes

Software Used:-

ANSA v22.1.0

Procedure:-

• First of all need to open the given model and then need to switch to PID mode to view the errors more effectively as shown in fig.

• Then need to delete the overlapping surfaces by seperating them and selecting them as shown as fig.

• After that need to delete the extra surfaces presented on the model by using delete and SURFACES>>NEW>>COONS options as shown in fig.

• After that need to fill the single CONS surfaces by using new surface option as shown in fig.

• After that need to create the surface to clear the singe CONS on Compressor casing by using TRANSFORMER>>COPY>>SYMMETRY>>AXIS 3 POINTS PLANE option as shown fig.

• After need to close the hole on the transformed surface by using fillhole option as shown in fig.

• After that need to clear the intersecting error by using intersection and delete option as shown in figs.

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• After that need to clear the extra surfaces and overlappig surfaces on the blades, shaft rotor and impeller as shown in figs.

• After that need to close the open surfaces to perform CFD mesh as shown in figs.

• After that need to assign the PIDs as per requirements by renaming and creating new PIDs as shown in fig.

• After assigning PIDs need to perform the surface mesh operation by assigning the mesh length as per last challenge for the required mesh length for each PIDs.
• In that, some unmeshed surfaces are found due to the different mesh length to the nearby surfaces.
• To overcome that have to remesh the unmeshed surfaces by assigning the mesh length in the range condition of the nearby surfaces by repeating the same procedure
• After that full surface mesh operation completed as shown in fig.

• After that need to shift the volumetric mesh mode to perform volumetric meshing operation.
• In that first need to the define the volumes by using VOLUME>>DEFINE option as shown in fig.

• After that need to delete the thickeness volumes of the defined list to get only the fluid flow region to perform the CFD mesh as shown in figs.

• After that need to define the mesh type as TETRA CFD in the dialogue box in volume list.
• Then need to perform the volume meshing operation by using remesh option for each volumes as shown in fig.

Result:-

The surface mesh and volume mesh operations are done as per the requirement as shown in fig.

The link for the ANSA file of the finished operation is https://drive.google.com/file/d/1-0T0hYGdH5KSkt09c_0xNM95k_IE16mk/view?usp=sharing