Week 3 Challenge : CFD meshing on Turbocharger
https://drive.google.com/file/d/1GCaqifnQTR0arCpEhHyP9mhSv16NUXqk/view?usp=share_link
PLease find the attached file
TURBOCHARGER:
A Turbocharger is in the form of forced induction which forces the air into the Internal Combustion Engine. It increases the amount of air entering the engine to create more power. A turbocharger has the compressor powered by a turbine. The turbine is driven by the exhaust gas from the engine. It does not use a direct mechanical drive. This helps to improve the performance of the turbocharger. It is generally called as Turbo (or) Gas Compressor. It increases the power output of the equipped engine by more than 30% to 40% compared to the normal engines.
(1) Cleaning-up the Model:
The given model file is opened and it will be shown as a wireframe model.
Then we have to clear the errors which are acquired during the designing. It can be seen that there was some glitching on the surface of the model, which is due to imperfect designing, that is, the presence of unwanted components in the inner parts of the model. With this surface glitch, there were some of the errors on the surfaces too. These errors are identified by single cons on the surfaces. We have to Check ON in visualizing the CONS to identify where the single CONS are in the Process Parameters on the Quality Criteria.
(2) Assigning PIDs:
Then the next phase is to assigning the Property IDs (PIDs). This is used to differentiate each component with different names and colors and to perform different meshes too. The bulb in the selected PID is glow based on whether the selected PID is visible or not. For the invisible inner components, the bulb will not glow. Latterly, the Compress option is used to view only the visible components in the model. This option generally simplifies the model by not showing the invisible components. The most important to know about the compressor option is, once compression is done, we cannot retrieve those components in the model.
https://drive.google.com/file/d/1GCaqifnQTR0arCpEhHyP9mhSv16NUXqk/view?usp=share_link
(3)Is 2D Mesh is Essential?:
Then after creating the PIDs, we have to combine those components, that is, to make it the same control volume. So we have to delete the closed surfaces in between the faces the components to stick them to make as to share the same control volume. This action is first implemented to compressor blades and then to go on the other components.In this , we have to do a Volume Mesh for the model. But before doing a Volume Mesh, we must know that, the model must be undergo Surface Mesh before going to Volume Mesh.So we need to do a Surface Mesh here.
(4)Rectifying Problems In 2D Mesh because of Property Mesh:
The next thing is to discuss is there is no problem that will arise when we mesh the full component in one single mesh length. But when we mesh the different components with different mesh length the problem will occur. It can be seen that meshing is not done on one surface which is due to software confusion on which part has to mesh with which mesh length. The meshing of different components with different mesh lengths is done by using the Properties Dialog box. Selecting the required PID which have to mesh, right-click on it, and select show only option and perform mesh on a given mesh length. This is known as Property Mesh.
(5)Volume Mesh:
Then after this, Volumetric Mesh has to be done. The Volume Mesh is differ from Surface Mesh may be regular or irregular which is used to compute the internal stresses and forces in an object throughout the entire volume of the object. Here, we have a two objects, compressor and turbine and these two objects should have a seperate Volumes to mesh. So we need to create a seperate Volumes for both Compressor and Turbine. For that, we need to cover those surface to make them as a individual entire volume. So, we covered the inlets and outlets of both Compressor and the Turbine by creating the new surface and alloting a new PIDs too.
(6)Detailed View Of Volume Mesh:
After Volumetric Mesh is done, let examine the meshing by removing some parts in Meshing. In this, we can see that in the boundaries of components such as turbine impeller, compressor two stage blades, compressor casing there was the coarse mesh and in the surfaces away from these boundaries, we have very fine meshing. This is because, in those boundaries and interfaces the internal stresses of the fluids are more when compared to the places where away from the interfaces. So in those places, meshing is very coarse and dense.In our meshed component.
https://drive.google.com/file/d/1GCaqifnQTR0arCpEhHyP9mhSv16NUXqk/view?usp=share_link