1 // Copyright (c) 2017-2022, Lawrence Livermore National Security, LLC and other CEED contributors. 2 // All Rights Reserved. See the top-level LICENSE and NOTICE files for details. 3 // 4 // SPDX-License-Identifier: BSD-2-Clause 5 // 6 // This file is part of CEED: http://github.com/ceed 7 8 /** 9 @brief Ceed QFunction for applying the 2D Poisson operator 10 **/ 11 12 #ifndef poisson2dapply_h 13 #define poisson2dapply_h 14 15 #include <ceed.h> 16 17 CEED_QFUNCTION(Poisson2DApply)(void *ctx, const CeedInt Q, 18 const CeedScalar *const *in, 19 CeedScalar *const *out) { 20 // *INDENT-OFF* 21 // in[0] is gradient u, shape [2, nc=1, Q] 22 // in[1] is quadrature data, size (3*Q) 23 const CeedScalar (*ug)[CEED_Q_VLA] = (const CeedScalar(*)[CEED_Q_VLA])in[0], 24 (*q_data)[CEED_Q_VLA] = (const CeedScalar(*)[CEED_Q_VLA])in[1]; 25 // out[0] is output to multiply against gradient v, shape [2, nc=1, Q] 26 CeedScalar (*vg)[CEED_Q_VLA] = (CeedScalar(*)[CEED_Q_VLA])out[0]; 27 // *INDENT-ON* 28 29 const CeedInt dim = 2; 30 31 // Quadrature point loop 32 CeedPragmaSIMD 33 for (CeedInt i=0; i<Q; i++) { 34 // Read qdata (dXdxdXdxT symmetric matrix) 35 // Stored in Voigt convention 36 // 0 2 37 // 2 1 38 // *INDENT-OFF* 39 const CeedScalar dXdxdXdxT[2][2] = {{q_data[0][i], 40 q_data[2][i]}, 41 {q_data[2][i], 42 q_data[1][i]} 43 }; 44 // *INDENT-ON* 45 46 // Apply Poisson operator 47 // j = direction of vg 48 for (CeedInt j=0; j<dim; j++) 49 vg[j][i] = (ug[0][i] * dXdxdXdxT[0][j] + 50 ug[1][i] * dXdxdXdxT[1][j]); 51 } // End of Quadrature Point Loop 52 53 return CEED_ERROR_SUCCESS; 54 } 55 56 #endif // poisson2dapply_h 57