#include "cs_defs.h"
Go to the source code of this file.
Data Structures | |
struct | cs_wall_distance_options_t |
Functions | |
void | cs_wall_distance (int iterns) |
Compute distance to wall by solving a 3d diffusion equation. Solve. More... | |
void | cs_wall_distance_yplus (cs_real_t visvdr[]) |
This subroutine computes the dimensionless distance to the wall solving a steady transport equation. More... | |
cs_wall_distance_options_t * | cs_get_glob_wall_distance_options (void) |
Provide read/write access to cs_glob_wall_distance. More... | |
Variables | |
const cs_wall_distance_options_t * | cs_glob_wall_distance_options |
cs_wall_distance_options_t* cs_get_glob_wall_distance_options | ( | void | ) |
Provide read/write access to cs_glob_wall_distance.
void cs_wall_distance | ( | int | iterns | ) |
Compute distance to wall by solving a 3d diffusion equation. Solve.
\[ -\divs ( \grad \varia ) = 1 \]
with:
\[ d \simeq -|\grad \varia | + \sqrt{ \grad \varia \cdot \grad \varia +2 \varia } \]
[in] | iterns | iteration number on Navier-Stokes equations |
void cs_wall_distance_yplus | ( | cs_real_t | visvdr[] | ) |
This subroutine computes the dimensionless distance to the wall solving a steady transport equation.
This function solves the following steady pure convection equation on \( \varia \):
\[ \divs \left( \varia \vect{V} \right) - \divs \left( \vect{V} \right) \varia = 0 \]
where the vector field \( \vect{V} \) is defined by:
\[ \vect{V} = \dfrac{ \grad y }{\norm{\grad y} } \]
The boundary conditions on \( \varia \) read:
\[ \varia = \dfrac{u_\star}{\nu} \textrm{ on walls} \]
\[ \dfrac{\partial \varia}{\partial n} = 0 \textrm{ elsewhere} \]
Then the dimensionless distance is deduced by:
\[ y^+ = y \varia \]
Then, Imposition of an amortization of Van Driest type for the LES. \( \nu_T \) is absorbed by \( (1-\exp(\dfrac{-y^+}{d^+}))^2 \) where \( d^+ \) is set at 26.
[in] | visvdr | dynamic viscosity in edge cells after driest velocity amortization |
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extern |