cl_IFG_TET4B.hpp

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/*
 * BELFEM -- The Berkeley Lab Finite Element Framework
 * Copyright (c) 2026, The Regents of the University of California,
 * through Lawrence Berkeley National Laboratory (subject to receipt of any required
 * approvals from the U.S. Dept. of Energy).  All rights reserved.
 *
 * Developers: Christian Messe, Gregory Giard
 *
 * See the top-level LICENSE file for the complete license and disclaimer.
 */
 
#ifndef BELFEM_CL_IFG_TET4B_HPP
#define BELFEM_CL_IFG_TET4B_HPP
 
#include "cl_IF_InterpolationFunctionTemplate.hpp"
 
namespace belfem
{
    namespace fem
    {
//------------------------------------------------------------------------------

         
//------------------------------------------------------------------------------
 
        template<>
        InterpolationOrder
        InterpolationFunctionTemplate<
                GeometryType::TET, InterpolationType::BubbleFace1, 3, 1 >
        ::interpolation_order() const
        {
            return InterpolationOrder::QUADRATIC;
        }
 
//------------------------------------------------------------------------------
 
        template<>
        ElementType
        InterpolationFunctionTemplate<
                 GeometryType::TET, InterpolationType::BubbleFace1, 3, 1 >
        ::element_type() const
        {
            return ElementType::TET4;
        }
 
//------------------------------------------------------------------------------
 
 
        template<>
        void
        InterpolationFunctionTemplate<
                GeometryType::TET, InterpolationType::BubbleFace1, 3, 1 >
        ::param_coords( Matrix <real> & aXiHat ) const
        {
            aXiHat.set_size( 1, 3 );
 
            aXiHat( 0, 0 ) =  0.0 ;
            aXiHat( 0, 1 ) =  1./3. ;
            aXiHat( 0, 2 ) =  1./3. ;
 
        }
        
//------------------------------------------------------------------------------
 
        template<>
        void
        InterpolationFunctionTemplate<
                GeometryType::TET, InterpolationType::BubbleFace1, 3, 1 >::N(
                const Vector <real> & aXi,
                Matrix <real> & aN ) const
        {
            const real  eta = aXi( 1 );
            const real zeta = aXi( 2 );
            
            aN.set_size( 1, 1 );
            aN( 0, 0 ) = 27.*eta*zeta*(1.-eta-zeta) ;
        }
        
 
//------------------------------------------------------------------------------
 
        template<>
        void
        InterpolationFunctionTemplate<
                GeometryType::TET, InterpolationType::BubbleFace1, 3, 1 >::dNdXi(
                const Vector <real> & aXi,
                Matrix <real> & adNdXi ) const
        {
            const real  eta = aXi( 1 );
            const real zeta = aXi( 2 );
 
            adNdXi.set_size( 3, 1 );
            adNdXi( 0, 0 ) = 0.0 ;  // dN/dxi
            adNdXi( 1, 0 ) = 27. * zeta * ( 1. - 2.*eta - zeta) ;   // dN/deta
            adNdXi( 2, 0 ) = 27. * eta * ( 1. - eta - 2.*zeta );  // dN/dzeta
        }
 
//------------------------------------------------------------------------------
 
 
        template<>
        void
        InterpolationFunctionTemplate<
                GeometryType::TET, InterpolationType::BubbleFace1, 3, 1 >::d2NdXi2(
                const Vector <real> & aXi,
                Matrix <real> & ad2NdXi2 ) const
        {
            const real   eta = aXi( 1 );
            const real  zeta = aXi( 2 );
 
            ad2NdXi2.set_size( 6,1 );
 
            // d²N/dxi²
            ad2NdXi2( 0, 0 ) =  0.0 ;
            
            // d²N/deta²
            ad2NdXi2( 1, 0 ) =  -54. * zeta ;
            
            // d²N/dzeta²
            ad2NdXi2( 2, 0 ) =  -54. * eta ;
            
            // d²N/(deta*dzeta)
            ad2NdXi2( 3, 0 )  = 27. - 54. * ( eta + zeta );
            
            // d²N/(dxi*dzeta)
            ad2NdXi2( 4, 0 )  = 0.0 ;
            
            // d²N/(dxi*deta)
            ad2NdXi2( 5, 0 )  = 0.0 ;
            
        }
 
//------------------------------------------------------------------------------
    }
}
#endif //BELFEM_CL_IFG_TET4B_HPP