💥💥💥 How to check where is the zone with bad orthogonality in Ansys Workbench ?

 Orthogonal quality is a measure of how well the mesh elements are aligned with the geometry. A low orthogonal quality can cause problems in the simulation, such as inaccurate results, convergence issues, or invalid geometry. Here are some steps you can follow to check and improve your mesh quality:

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  First, you need to identify the zones where the orthogonal quality is below a certain threshold. You can do this by going to Mesh -> Statistics -> Mesh Metric and selecting Orthogonal Quality from the drop-down menu. You will see a graph of the orthogonal quality for each element type and layer. You can also use the filter option to select specific elements or layers that you want to analyze.
• Second, you need to zoom in on the areas where you have poor mesh and use a section plane to view all of the cells in a slice¹. If cell quality is poor, you need to see/show what’s going on in that area so it can be altered¹. You can use tools like geometry modification, face/edge sizing, or automatic node move to improve the shape of the cells²³.
• Third, you need to repeat the process for different regions of your model until you achieve a satisfactory level of orthogonal quality. You can also use other mesh metrics, such as skewness or Jacobian ratio, to complement your analysis⁴. ANSYS provides some guidelines and recommendations for different mesh metrics based on your application⁴.
• Fourth, you need to verify that your mesh meets the specific requirements for your physics model. You can do this by activating automatic shape checking in ANSYS Workbench by going to Mesh -> Quality -> Check Mesh Quality and picking an option from the drop-down menu⁴. The options are: No, Yes (Errors and Warnings), or Yes (Errors). If this is set to yes, then the meshing algorithm will ensure that the mesh generated meets certain error limits⁴.

Are in Ansys Fluent functions to improve mesh quality ?

Yes, there are some functions in Ansys Fluent that can help you improve your mesh quality. Mesh quality is a measure of how well the mesh elements are aligned with the geometry and how smooth and regular they are. A good mesh quality can ensure accurate results, convergence, and stability in your simulation.

Some of the functions that you can use to improve your mesh quality are:

• Sweep: This function allows you to create a hexagonal or tetrahedral mesh from a 2D geometry by sweeping along a curve or a surface. You can use this function to create a uniform and fine mesh for complex geometries¹².
• Body Sizing: This function allows you to adjust the size of the cells in an existing mesh by using different criteria, such as aspect ratio, skewness, or orthogonal quality. You can use this function to refine or coarsen your mesh based on your needs¹³.
• Pinch Control: This function allows you to control the shape of the cells in an existing mesh by using different methods, such as pinching, stretching, or shrinking. You can use this function to modify or simplify your geometry at specific locations¹⁴.
• Virtual Topology: This function allows you to create a virtual boundary around an object in your geometry and generate a new mesh that follows the shape of the object. You can use this function to create a smooth and continuous surface for complex geometries¹⁵.

These are some of the functions that I found from my web search results. You can learn more about them by watching some video tutorials or reading some online documentation.

How do I use Pinch Control in Ansys Fluent?

Pinch Control is a function in Ansys Fluent that allows you to control the shape of the cells in an existing mesh by using different methods, such as pinching, stretching, or shrinking. You can use this function to modify or simplify your geometry at specific locations¹².

To use Pinch Control in Ansys Fluent, you need to follow these steps:

• First, you need to select the entities that you want to pinch. You can use the selection tools in the Meshing application, such as the box selection tool or the polygon selection tool. You can also use the mouse to drag and select multiple entities.
• Second, you need to go to Mesh -> Pinch and choose a method from the drop-down menu. The methods are: Pinch, Stretch, and Shrink. Each method has different options that you can adjust according to your needs.
• Third, you need to click on Apply and then OK. The Meshing application will generate a new mesh that follows the shape of the selected entities. You can view the new mesh by going to Mesh -> View.

You can repeat this process for different regions of your model until you achieve a satisfactory level of mesh quality. You can also use other functions in Ansys Fluent, such as Sweep or Body Sizing, to improve your mesh quality based on your geometry³.

Can you recommend some best practices for meshing?

Sure, I can recommend some best practices for meshing. Meshing is the process of creating a finite representation of a physical domain in a computational fluid dynamics (CFD) simulation. A good mesh can ensure accurate results, convergence, and stability in your simulation. Here are some tips that I found from my web search results:

• Choose the right meshing technique for your geometry and physics model. There are different types of meshing techniques, such as structured or unstructured, regular or irregular, coarse or fine. Each technique has its advantages and disadvantages depending on the complexity and features of your geometry¹²³.
• Use appropriate meshing parameters and options to optimize your mesh quality and performance. You can use different criteria to define the size and shape of your cells, such as aspect ratio, skewness, orthogonal quality, volume change, etc. You can also use different methods to control the shape of your cells, such as pinching, stretching, or shrinking¹²³.
• Check and improve your mesh quality after generation. You can use various tools and functions in CFD software to identify and visualize bad cells or regions in your mesh. You can also use automatic shape checking to verify that your mesh meets the specific requirements for your physics model¹²³.
• Repeat the process for different regions of your model until you achieve a satisfactory level of mesh quality. You may need to adjust the meshing parameters or options for different parts of your model depending on their geometry and physics characteristics¹²³.

I hope this helps you with your problem. If you have any other questions, feel free to ask me 😊.