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 #include <ceed/types.h> 9 10 CEED_QFUNCTION(setup_mass)(void *ctx, const CeedInt Q, const CeedScalar *const *in, CeedScalar *const *out) { 11 const CeedScalar *J = in[0], *weight = in[1]; 12 CeedScalar *rho = out[0]; 13 for (CeedInt i = 0; i < Q; i++) { 14 rho[i] = weight[i] * (J[i + Q * 0] * J[i + Q * 3] - J[i + Q * 1] * J[i + Q * 2]); 15 } 16 return 0; 17 } 18 19 CEED_QFUNCTION(setup_diff)(void *ctx, const CeedInt Q, const CeedScalar *const *in, CeedScalar *const *out) { 20 // At every quadrature point, compute qw/det(J).adj(J).adj(J)^T and store 21 // the symmetric part of the result. 22 23 // in[0] is Jacobians with shape [2, nc=2, Q] 24 // in[1] is quadrature weights, size (Q) 25 const CeedScalar *J = in[0], *qw = in[1]; 26 27 // out[0] is qdata, size (Q) 28 CeedScalar *qd = out[0]; 29 30 // Quadrature point loop 31 for (CeedInt i = 0; i < Q; i++) { 32 // J: 0 2 qd: 0 2 adj(J): J22 -J12 33 // 1 3 2 1 -J21 J11 34 const CeedScalar J11 = J[i + Q * 0]; 35 const CeedScalar J21 = J[i + Q * 1]; 36 const CeedScalar J12 = J[i + Q * 2]; 37 const CeedScalar J22 = J[i + Q * 3]; 38 const CeedScalar w = qw[i] / (J11 * J22 - J21 * J12); 39 qd[i + Q * 0] = w * (J12 * J12 + J22 * J22); 40 qd[i + Q * 1] = w * (J11 * J11 + J21 * J21); 41 qd[i + Q * 2] = -w * (J11 * J12 + J21 * J22); 42 } 43 44 return 0; 45 } 46 47 CEED_QFUNCTION(apply)(void *ctx, const CeedInt Q, const CeedScalar *const *in, CeedScalar *const *out) { 48 // in[0] is gradient u, shape [2, nc=1, Q] 49 // in[1] is mass quadrature data, size (Q) 50 // in[2] is Poisson quadrature data, size (Q) 51 // in[3] is u, size (Q) 52 const CeedScalar *du = in[0], *qd_mass = in[1], *qd_diff = in[2], *u = in[3]; 53 54 // out[0] is output to multiply against v, size (Q) 55 // out[1] is output to multiply against gradient v, shape [2, nc=1, Q] 56 CeedScalar *v = out[0], *dv = out[1]; 57 58 // Quadrature point loop 59 for (CeedInt i = 0; i < Q; i++) { 60 // Mass 61 v[i] = qd_mass[i] * u[i]; 62 // Diff 63 const CeedScalar du0 = du[i + Q * 0]; 64 const CeedScalar du1 = du[i + Q * 1]; 65 dv[i + Q * 0] = qd_diff[i + Q * 0] * du0 + qd_diff[i + Q * 2] * du1; 66 dv[i + Q * 1] = qd_diff[i + Q * 2] * du0 + qd_diff[i + Q * 1] * du1; 67 } 68 69 return 0; 70 } 71