1 files changed, 93 insertions, 0 deletions
diff --git a/modules/core/c++/descriptor/d3q27.hpp b/modules/core/c++/descriptor/d3q27.hpp
new file mode 100644
index 0000000..7b3c84f
--- /dev/null
+++ b/modules/core/c++/descriptor/d3q27.hpp
@@ -0,0 +1,93 @@
+#pragma once
+
+namespace kel {
+namespace lbm {
+namespace sch {
+using D3Q27 = Descriptor<3u,27u>;
+}
+
+template<typename T>
+class df_info<T,sch::Descriptor<3, 27>> {
+public:
+	using Descriptor = sch::Descriptor<3,27>;
+
+	static constexpr uint64_t D = 3u;
+	static constexpr uint64_t Q = 27u;
+
+	static constexpr std::array<std::array<int32_t, D>, Q> directions = {{
+		{ 0, 0, 0},  // 0
+		// Into 1D
+		{-1, 0, 0},  // 1
+		{ 1, 0, 0},  // 2
+		// Expand into 2D
+		{ 0, -1, 0}, // 3
+		{-1, -1, 0}, // 4
+		{ 1, -1, 0}, // 5
+		{ 0, 1, 0},  // 6
+		{-1, 1, 0},  // 7
+		{ 1, 1, 0},  // 8
+		// Expand into 3D
+		{ 0, 0, -1}, // 9
+		{-1, 0, -1}, // 10
+		{ 1, 0, -1}, // 11
+		{ 0, -1, -1},// 12
+		{-1, -1, -1},// 13
+		{ 1, -1, -1},// 14
+		{ 0, 1, -1}, // 15
+		{-1, 1, -1}, // 16
+		{ 1, 1, -1}, // 17
+		{ 0, 0, 1},  // 18
+		{-1, 0, 1},  // 19
+		{ 1, 0, 1},  // 20
+		{ 0, -1, 1}, // 21
+		{-1, -1, 1}, // 22
+		{ 1, -1, 1}, // 23
+		{ 0, 1, 1},  // 24
+		{-1, 1, 1},  // 25
+		{ 1, 1, 1}   // 26
+	}};
+
+	static constexpr std::array<typename saw::native_data_type<T>::type,Q> weights = {
+		8./27.,
+		// 1D
+		1./36.,
+		1./36.,
+		// 2D
+		1./36.,
+		1./54.,
+		1./54.,
+		1./36.,
+		1./54.,
+		1./54.,
+		// 3D
+		1./36.,
+		1./54.,
+		1./54.,
+		1./54.,
+		1./216.,
+		1./216.,
+		1./54.,
+		1./216.,
+		1./216.,
+		1./36.,
+		1./54.,
+		1./54.,
+		1./54.,
+		1./216.,
+		1./216.,
+		1./54.,
+		1./216.,
+		1./216.
+	};
+
+	static constexpr std::array<uint64_t,Q> opposite_index = {
+		0,2,1,
+		6,8,7,3,5,4,
+		18,20,19,24,26,25,21,23,22,9,11,10,15,17,16,12,14,13
+	};
+
+	static constexpr typename saw::native_data_type<T>::type inv_cs2 = 3.0;
+	static constexpr typename saw::native_data_type<T>::type cs2 = 1./3.;
+};
+}
+}