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 CEED_QFUNCTION(Poisson2DApply)(void *ctx, const CeedInt Q, 16 const CeedScalar *const *in, 17 CeedScalar *const *out) { 18 // *INDENT-OFF* 19 // in[0] is gradient u, shape [2, nc=1, Q] 20 // in[1] is quadrature data, size (3*Q) 21 const CeedScalar (*ug)[CEED_Q_VLA] = (const CeedScalar(*)[CEED_Q_VLA])in[0], 22 (*q_data)[CEED_Q_VLA] = (const CeedScalar(*)[CEED_Q_VLA])in[1]; 23 // out[0] is output to multiply against gradient v, shape [2, nc=1, Q] 24 CeedScalar (*vg)[CEED_Q_VLA] = (CeedScalar(*)[CEED_Q_VLA])out[0]; 25 // *INDENT-ON* 26 27 const CeedInt dim = 2; 28 29 // Quadrature point loop 30 CeedPragmaSIMD 31 for (CeedInt i=0; i<Q; i++) { 32 // Read qdata (dXdxdXdxT symmetric matrix) 33 // Stored in Voigt convention 34 // 0 2 35 // 2 1 36 // *INDENT-OFF* 37 const CeedScalar dXdxdXdxT[2][2] = {{q_data[0][i], 38 q_data[2][i]}, 39 {q_data[2][i], 40 q_data[1][i]} 41 }; 42 // *INDENT-ON* 43 44 // Apply Poisson operator 45 // j = direction of vg 46 for (CeedInt j=0; j<dim; j++) 47 vg[j][i] = (ug[0][i] * dXdxdXdxT[0][j] + 48 ug[1][i] * dXdxdXdxT[1][j]); 49 } // End of Quadrature Point Loop 50 51 return CEED_ERROR_SUCCESS; 52 } 53 54 #endif // poisson2dapply_h 55