Fluent Meshing Training Course: Session 5, Add local size

Description

Session 5: Adding Local Size

In Fluent Meshing, local size controls in meshing allow users to selectively modify the mesh density in specific regions of interest, balancing the accuracy of the solution by concentrating mesh elements where they are computationally important.

5.1. Face Size and Body Size

In Fluent Meshing, face size applies a modification to selected (named) boundary faces and controls the size of mesh elements in these regions, such as inlets and outlets. Body size extends this concept to volumetric regions, allowing the user to modify the volume of geometric objects, and the elements within this volume are controllable, and its use is to ensure higher resolution in areas of complex flow or around important features.

5.2. Body Influence – Face Influence (BOIs and SOIs)

Body Influence (BOI) creates a modified mesh across a user-defined volumetric region in the generated geometry software, without changing the original geometry. Surface Influence (SOI) creates a modification and affects only the area around this surface. Both methods of mesh control are performed on selected areas, while maintaining the integrity of the base geometry.

5.3. Curvature Proximity

Curvature controls automatically modify mesh elements along curved surfaces based on angular changes, ensuring accurate geometric representation in areas with curvature. Proximity measurement produces elements in the computational mesh that are specifically narrow for gaps, where the user can enter the number of elements per gap.

5.4. Creating Local Modification Regions

In Fluent Meshing, local modification regions define specific geometric shapes (boxes, cylinders, or offset Face) where the number of meshes can be controlled. These regions can be precisely positioned within the domain using coordinate specifications or relative positioning, allowing for targeted modification around complex parts without changing the original geometry.