Wall distance calculation methods

Use the Wall Distance Calculation Method option to control how the wall distance is computed in an analysis when you use turbulence models such as Spalart-Allmaras, K-epsilon, K-omega, and SST. It allows you to select one of the following methods:

Geometric Search

Provides accurate results by computing the exact geometric distance between each fluid node and the closest no-slip wall boundary node. With this method, computation time increases significantly when the mesh nodal number increases.

Partial Differential Equation

Computes the wall distance by solving the Poisson equation on the wall distance function. This method requires less computation time than the Geometric Search method. Accuracy of this method can vary depending to the number of wall boundaries in a model and their relative distance to each other.

The Partial Differential Equation is the only supported method when you use immersed boundary meshes. It is also used in Multiphysics analysis with the Laplace smoothing equation method to compute mesh movements. The Partial Differential Equation is useful in fluid-structure interaction modeling, when you use turbulence models which require a wall distance computation.

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