From a92271176a19e06611099c0eccc4e6a6887f4915 Mon Sep 17 00:00:00 2001 From: Adrian Kummerlaender Date: Mon, 17 May 2021 00:30:13 +0200 Subject: Extract public version of SweepLB --- src/LLBM/collect_moments.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 src/LLBM/collect_moments.h (limited to 'src/LLBM/collect_moments.h') diff --git a/src/LLBM/collect_moments.h b/src/LLBM/collect_moments.h new file mode 100644 index 0000000..afd5d59 --- /dev/null +++ b/src/LLBM/collect_moments.h @@ -0,0 +1,25 @@ +#pragma once + +#include "concepts.h" + +struct CollectMomentsF { + +static constexpr unsigned size = 4; + +template +static void observe(V f_curr[19], V* momenta) { + V m0 = f_curr[10] + f_curr[13] + f_curr[17]; + V m1 = f_curr[14] + f_curr[5] + f_curr[6]; + V m2 = f_curr[1] + f_curr[2] + f_curr[4]; + V m3 = m0 + m1 + m2 + f_curr[0] + f_curr[11] + f_curr[12] + f_curr[15] + f_curr[16] + f_curr[18] + f_curr[3] + f_curr[7] + f_curr[8] + f_curr[9]; + V m4 = -f_curr[11] + f_curr[7]; + V m5 = -f_curr[15] + f_curr[3]; + V m6 = V{1}/m3; + V m7 = f_curr[0] - f_curr[18]; + momenta[0] = m3; + momenta[1] = m6*(m0 + m4 + m5 - f_curr[1] - f_curr[5] - f_curr[8]); + momenta[2] = m6*(m1 + m4 + m7 - f_curr[12] - f_curr[13] - f_curr[4]); + momenta[3] = m6*(m2 + m5 + m7 - f_curr[14] - f_curr[16] - f_curr[17]); +} + +}; -- cgit v1.2.3