1 files changed, 44 insertions, 0 deletions
diff --git a/tangle/LLBM/kernel/bounce_back.h b/tangle/LLBM/kernel/bounce_back.h
new file mode 100644
index 0000000..d7ec4a7
--- /dev/null
+++ b/tangle/LLBM/kernel/bounce_back.h
@@ -0,0 +1,44 @@
+#pragma once
+#include <LLBM/call_tag.h>
+
+struct BounceBackO {
+
+using call_tag = tag::call_by_cell_id;
+
+template <typename T, typename S>
+__device__ static void apply(descriptor::D2Q9, S f_curr[9], S f_next[9], std::size_t gid) {
+  f_next[0] = f_curr[8];
+  f_next[1] = f_curr[7];
+  f_next[2] = f_curr[6];
+  f_next[3] = f_curr[5];
+  f_next[4] = f_curr[4];
+  f_next[5] = f_curr[3];
+  f_next[6] = f_curr[2];
+  f_next[7] = f_curr[1];
+  f_next[8] = f_curr[0];
+}
+
+template <typename T, typename S>
+__device__ static void apply(descriptor::D3Q19, S f_curr[19], S f_next[19], std::size_t gid) {
+  f_next[0] = f_curr[18];
+  f_next[1] = f_curr[17];
+  f_next[2] = f_curr[16];
+  f_next[3] = f_curr[15];
+  f_next[4] = f_curr[14];
+  f_next[5] = f_curr[13];
+  f_next[6] = f_curr[12];
+  f_next[7] = f_curr[11];
+  f_next[8] = f_curr[10];
+  f_next[9] = f_curr[9];
+  f_next[10] = f_curr[8];
+  f_next[11] = f_curr[7];
+  f_next[12] = f_curr[6];
+  f_next[13] = f_curr[5];
+  f_next[14] = f_curr[4];
+  f_next[15] = f_curr[3];
+  f_next[16] = f_curr[2];
+  f_next[17] = f_curr[1];
+  f_next[18] = f_curr[0];
+}
+
+};