A method is developed for generating 3D 'viscous' unstructured grids on complex configurations. The approach stems from a natural extension of the Advancing Layers Method (ALM) which has been successfully applied for 2D in prior work. High-aspect-ratio tetrahedral cells are constructed in viscous dominated flow regions by the ALM, with the remaining isotropic cells generated by the conventional Advancing Front Method. Relying on a totally unstructured grid generation strategy, the method benefits from a high degree of flexibility required for generating grids around complex geometries. The method is robust, efficient, and automatic, capable of constructing quality viscous tetrahedral grids. A sample 3D viscous grid is presented to show the capability of the method.
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