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comparison +sbp/+implementations/d2_noneq_variable_8.m @ 1332:8e9df030a0a5 feature/D2_boundary_opt

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author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Wed, 04 May 2022 08:42:13 +0200
parents 855871e0b852
children b4e5e45bd239
comparison
equal deleted inserted replaced
1331:60c875c18de3 1332:8e9df030a0a5
206 R = (1/78400 / h) * transpose(DD_8) * C1 * DD_8 + (1/14700 / h) * transpose(DD_7) * C2 * DD_7 + (1/2520 / h) * transpose(DD_6) * C3 * DD_6 + (1/350 / h) * transpose(DD_5) * C4 * DD_5; 206 R = (1/78400 / h) * transpose(DD_8) * C1 * DD_8 + (1/14700 / h) * transpose(DD_7) * C2 * DD_7 + (1/2520 / h) * transpose(DD_6) * C3 * DD_6 + (1/350 / h) * transpose(DD_5) * C4 * DD_5;
207 207
208 D2 = D1 * C1 * D1 - H \ R; 208 D2 = D1 * C1 * D1 - H \ R;
209 end 209 end
210 210
211 % Few additional grid point in interior stencil cmp. to minimal 211 % Non-minimal 11 point stencil width
212 function D2 = D2_fun_nonminimal(c) 212 function D2 = D2_fun_nonminimal(c)
213 % Here we add variable diffusion 213 % Here we add variable diffusion
214 C1 = sparse(diag(c)); 214 C1 = sparse(diag(c));
215 C2 = 1/2 * diag(ones(m - 1, 1), -1) + 1/2 * diag(ones(m, 1), 0); C2(1, 2) = 1/2; 215 C2 = 1/2 * diag(ones(m - 1, 1), -1) + 1/2 * diag(ones(m, 1), 0); C2(1, 2) = 1/2;
216 C3 = 3/10 * diag(ones(m - 1, 1), -1) + 3/10 * diag(ones(m - 1, 1), 1) + 2/5 * diag(ones(m, 1), 0); C3(1, 3) = 3/10; C3(m, m - 2) = 3/10; 216 C3 = 3/10 * diag(ones(m - 1, 1), -1) + 3/10 * diag(ones(m - 1, 1), 1) + 2/5 * diag(ones(m, 1), 0); C3(1, 3) = 3/10; C3(m, m - 2) = 3/10;