1 // Copyright (c) 2017-2025, 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 #include <ceed/types.h> 12 13 CEED_QFUNCTION(Poisson2DApply)(void *ctx, const CeedInt Q, const CeedScalar *const *in, CeedScalar *const *out) { 14 // in[0] is gradient u, shape [2, nc=1, Q] 15 // in[1] is quadrature data, size (3*Q) 16 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]; 17 // out[0] is output to multiply against gradient v, shape [2, nc=1, Q] 18 CeedScalar(*vg)[CEED_Q_VLA] = (CeedScalar(*)[CEED_Q_VLA])out[0]; 19 20 const CeedInt dim = 2; 21 22 // Quadrature point loop 23 CeedPragmaSIMD for (CeedInt i = 0; i < Q; i++) { 24 // Read qdata (dXdxdXdxT symmetric matrix) 25 // Stored in Voigt convention 26 // 0 2 27 // 2 1 28 const CeedScalar dXdxdXdxT[2][2] = { 29 {q_data[0][i], q_data[2][i]}, 30 {q_data[2][i], q_data[1][i]} 31 }; 32 33 // Apply Poisson operator 34 // j = direction of vg 35 for (CeedInt j = 0; j < dim; j++) vg[j][i] = (ug[0][i] * dXdxdXdxT[0][j] + ug[1][i] * dXdxdXdxT[1][j]); 36 } // End of Quadrature Point Loop 37 38 return CEED_ERROR_SUCCESS; 39 } 40