Pull in basics from symlbm_playground

It's time to extract the generator-part of my GPU LBM playground and turn it
into a nice reusable library. The goal is to produce a framework that can be
used to generate collision and streaming programs from symbolic descriptions.

i.e. it should be possible to select a LB model, the desired boundary
conditions as well as a data structure / streaming model and use this
information to automatically generate matching OpenCL / CUDA / C++
programs.

1 files changed, 18 insertions, 0 deletions

diff --git a/boltzgen/lbm/model/D3Q7.py b/boltzgen/lbm/model/D3Q7.py
new file mode 100644
index 0000000..04e16a3
--- /dev/null
+++ b/boltzgen/lbm/model/D3Q7.py
@@ -0,0 +1,18 @@
+from sympy import *
+
+q = 7
+d = 3
+
+c = [ Matrix(x) for x in [
+    ( 0, 0, 1),
+    ( 0, 1, 0), (-1, 0, 0), ( 0, 0, 0), ( 1, 0, 0), ( 0, -1, 0),
+    ( 0, 0,-1)
+]]
+
+w = [Rational(*x) for x in [
+    (1,8),
+    (1,8), (1,8), (1,4), (1,8), (1,8),
+    (1,8)
+]]
+
+c_s = sqrt(Rational(1,4))