1 // Copyright (c) 2017-2024, 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 geometric data for the 3D Poisson operator 10 **/ 11 12 #include <ceed.h> 13 14 CEED_QFUNCTION(Poisson3DApply)(void *ctx, const CeedInt Q, const CeedScalar *const *in, CeedScalar *const *out) { 15 // in[0] is gradient u, shape [3, nc=1, Q] 16 // in[1] is quadrature data, size (6*Q) 17 const CeedScalar(*ug)[CEED_Q_VLA] = (const CeedScalar(*)[CEED_Q_VLA])in[0], (*q_data)[CEED_Q_VLA] = (const CeedScalar(*)[CEED_Q_VLA])in[1]; 18 // out[0] is output to multiply against gradient v, shape [3, nc=1, Q] 19 CeedScalar(*vg)[CEED_Q_VLA] = (CeedScalar(*)[CEED_Q_VLA])out[0]; 20 21 const CeedInt dim = 3; 22 23 // Quadrature point loop 24 CeedPragmaSIMD for (CeedInt i = 0; i < Q; i++) { 25 // Read qdata (dXdxdXdxT symmetric matrix) 26 // Stored in Voigt convention 27 // 0 5 4 28 // 5 1 3 29 // 4 3 2 30 const CeedScalar dXdxdXdxT[3][3] = { 31 {q_data[0][i], q_data[5][i], q_data[4][i]}, 32 {q_data[5][i], q_data[1][i], q_data[3][i]}, 33 {q_data[4][i], q_data[3][i], q_data[2][i]} 34 }; 35 36 // Apply Poisson Operator 37 // j = direction of vg 38 for (CeedInt j = 0; j < dim; j++) vg[j][i] = (ug[0][i] * dXdxdXdxT[0][j] + ug[1][i] * dXdxdXdxT[1][j] + ug[2][i] * dXdxdXdxT[2][j]); 39 } // End of Quadrature Point Loop 40 41 return CEED_ERROR_SUCCESS; 42 } 43