cs_fan.h

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#ifndef CS_FAN_H
#define CS_FAN_H
 
/*============================================================================
 * Fan modeling through velocity source terms.
 *============================================================================*/
 
/*
  This file is part of code_saturne, a general-purpose CFD tool.
 
  Copyright (C) 1998-2026 EDF S.A.
 
  This program is free software; you can redistribute it and/or modify it under
  the terms of the GNU General Public License as published by the Free Software
  Foundation; either version 2 of the License, or (at your option) any later
  version.
 
  This program is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  details.
 
  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
  Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
 
/*----------------------------------------------------------------------------*/
 
/*----------------------------------------------------------------------------
 * Standard C library headers
 *----------------------------------------------------------------------------*/
 
/*----------------------------------------------------------------------------
 * Local headers
 *----------------------------------------------------------------------------*/
 
#include "base/cs_base.h"
 
#include "mesh/cs_mesh.h"
#include "mesh/cs_mesh_quantities.h"
 
/*============================================================================
 * Structure definition
 *============================================================================*/
 
typedef struct _cs_fan_t cs_fan_t;
 
/*============================================================================
 * Public function prototypes
 *============================================================================*/
 
/*----------------------------------------------------------------------------
 * Fan definition (added to the ones previously defined)
 *
 * Fans are handled as explicit momentum source terms at the given location,
 * based on the fan's axis and diameter.
 * The fan's pressure characteristic curve is defined by 3 coefficients,
 * such that:
 *   delta P = C_0 + C_1.flow + C_2.flow^2
 * An axial torque may also be defined for the 3D model.
 *
 * parameters:
 *   fan_dim             <-- fan dimension:
 *                             2: pseudo-2D (extruded mesh)
 *                             3: 3D (standard)
 *   mode                <-- mode:
 *                             0: fan
 *                             1: wind turbine
 *   inlet_axis_coords   <-- intersection coords. of axis and inlet face
 *   outlet_axis_coords  <-- intersection coords. od axis and outlet face
 *   fan_radius          <-- fan radius
 *   blades_radius       <-- blades radius
 *   hub_radius          <-- hub radius
 *   curve_coeffs        <-- coefficients of degre 0, 1 and 2 of
 *                           the pressure drop/flow rate
 *                           characteristic curve
 *   axial_torque        <-- fan axial torque
 *----------------------------------------------------------------------------*/
 
void
cs_fan_define(int              fan_dim,
              int              mode,
              const cs_real_t  inlet_axis_coords[3],
              const cs_real_t  outlet_axis_coords[3],
              cs_real_t        fan_radius,
              cs_real_t        blades_radius,
              cs_real_t        hub_radius,
              const cs_real_t  curve_coeffs[3],
              cs_real_t        axial_torque);
 
/*----------------------------------------------------------------------------
 * Destroy the structures associated with fans.
 *----------------------------------------------------------------------------*/
 
void
cs_fan_destroy_all(void);
 
/*----------------------------------------------------------------------------
 * Return number of fans.
 *
 * returns:
 *   number of defined fans
 *----------------------------------------------------------------------------*/
 
int
cs_fan_n_fans(void);
 
/*----------------------------------------------------------------------------
 * Create fans field.
 *----------------------------------------------------------------------------*/
 
void
cs_fan_field_create(void);
 
/*----------------------------------------------------------------------------
 * Log fans definition setup information.
 *----------------------------------------------------------------------------*/
 
void
cs_fan_log_setup(void);
 
/*----------------------------------------------------------------------------
 * Log fan information for a given iteration.
 *----------------------------------------------------------------------------*/
 
void
cs_fan_log_iteration(void);
 
/*----------------------------------------------------------------------------
 * Define the cells belonging to the different fans.
 *
 * parameters:
 *   mesh            <-- associated mesh structure
 *   mesh_quantities <-- mesh quantities
 *----------------------------------------------------------------------------*/
 
void
cs_fan_build_all(const cs_mesh_t             *mesh,
                 const cs_mesh_quantities_t  *mesh_quantities);
 
/*----------------------------------------------------------------------------
 * Compute the flows through the fans.
 *
 * parameters:
 *   mesh            <-- mesh structure
 *   mesh_quantities <-- mesh quantities
 *   i_mass_flux     <-- interior faces mass flux
 *   b_mass_flux     <-- boundary faces mass flux
 *   c_rho           <-- density at cells
 *   b_rho           <-- density at boundary faces
 *----------------------------------------------------------------------------*/
 
void
cs_fan_compute_flows(const cs_mesh_t             *mesh,
                     const cs_mesh_quantities_t  *mesh_quantities,
                     const cs_real_t              i_mass_flux[],
                     const cs_real_t              b_mass_flux[],
                     const cs_real_t              c_rho[],
                     const cs_real_t              b_rho[]);
 
/*----------------------------------------------------------------------------
 * Compute the force induced by the fans (needs a previous calculation
 * of the flows through each fan).
 *
 * The induced force is added to the array CRVXEP (which can have other
 * other contributions).
 *
 * parameters:
 *   mesh_quantities <-- mesh quantities
 *   source_t        <-> explicit source term for the velocity
 *----------------------------------------------------------------------------*/
 
void
cs_fan_compute_force(const cs_mesh_quantities_t  *mesh_quantities,
                     cs_real_3_t                  source_t[]);
 
/*----------------------------------------------------------------------------
 * Flag the cells belonging to the different fans
 * (by the fan id, -1 otherwise)
 *
 * parameters:
 *   mesh        <-- associated mesh structure
 *   cell_fan_id --> indicator by cell
 *----------------------------------------------------------------------------*/
 
void
cs_fan_flag_cells(const cs_mesh_t  *mesh,
                  int               cell_fan_id[]);
 
/*----------------------------------------------------------------------------
 * Selection function for cells belonging to fans.
 *
 * This function may be used for the definition of postprocessing meshes.
 *
 * param
 * \param[in, out]  input    pointer to input (unused here)
 * \param[out]      n_cells  number of selected cells
 * \param[out]      cell_ids array of selected cell ids (0 to n-1 numbering)
 */
/*----------------------------------------------------------------------------*/
 
void
cs_fan_cells_select(void         *input,
                    cs_lnum_t    *n_cells,
                    cs_lnum_t   **cell_ids);
 
/*----------------------------------------------------------------------------*/
 
#endif /* CS_FAN_H */