navier_stokes_blocks/examples/example_external_flow/boundaryConditions.hpp

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/*!
 *  @file
 *  @brief File containing the boundary conditions of the external fluid flow example
 *
 *  @author Davide Forti <davide.forti@epfl.ch>
 *
 *  Contains the functions to be assigned as boundary conditions, in the file boundaryConditions.hpp . The functions
 *  can depend on time and space, while they can take in input an ID specifying one of the three principal axis
 *  if the functions to assign is vectorial and the boundary condition is of type \c Full \c.
 */

#ifndef BCNS_HPP
#define BCNS_HPP

// LifeV includes
#include <lifev/core/LifeV.hpp>
#include <lifev/core/fem/BCHandler.hpp>

#include "ud_functions.hpp"

namespace LifeV
{

typedef boost::shared_ptr<BCHandler> bcPtr_Type;

bcPtr_Type BCh_fluid ()
{
    BCFunctionBase uZero( zeroFunction );
    BCFunctionBase uInflow( inflowFunction );

    std::vector<LifeV::ID> xComp(1), yComp(1), zComp(1);
    xComp[0] = 0;
    yComp[0] = 1;
    zComp[0] = 2;

    bcPtr_Type bcH (new BCHandler );

    bcH->addBC( "Inflow",       1, Essential, Full,         uInflow, 3 );
    bcH->addBC( "Outflow",      3, Natural,   Full,         uZero,   3 );
    bcH->addBC( "TopBottom",    2, Essential, Component,    uZero,   yComp  );
    bcH->addBC( "LeftRight",    5, Essential, Component,    uZero,   zComp  );
    //bcH->addBC ("Cylinder" ,    4, Essential, Full,           uZero,   3 ); // commented since we impose weak bc here, see the datafile

    return bcH;
}

bcPtr_Type BCh_drag ()
{
    bcPtr_Type bcH (new BCHandler );

    BCFunctionBase uOneX( oneFunctionX );

    bcH->addBC( "CylinderDrag",   4, Essential, Full, uOneX, 3 );

    return bcH;
}

bcPtr_Type BCh_lift ()
{
    bcPtr_Type bcH (new BCHandler );

    BCFunctionBase uOneY( oneFunctionY );

    bcH->addBC( "CylinderLift",   4, Essential, Full, uOneY, 3 );

    return bcH;
}

}

#endif