Support bounded shared transverse motion and steady pinball demo

research/steady_pinball/config.json

@@ -0,0 +1,49 @@
+{
+    "_doc": "Legacy geometry Re_D=50, U0=0.01, SI=800 baseline (kar_legacy_re50d_u001)",
+    "grid": {
+        "lattice_model": "D2Q9",
+        "nx": 1280,
+        "ny": 512,
+        "nz": 1
+    },
+    "physics": {
+        "data_type": "FP32",
+        "viscosity": 0.004,
+        "velocity": 0.01,
+        "rho": 1.0
+    },
+    "method": {
+        "collision": "MRT",
+        "streaming": "double_buffer",
+        "store_precision": "FP32",
+        "ddf_shifting": false,
+        "les": {
+            "enabled": false,
+            "cs": 0.16,
+            "closed_form": true
+        },
+        "trt": {
+            "magic_param": 0.1875
+        },
+        "inlet": {
+            "profile": "parabolic",
+            "scheme": "regularized",
+            "regularized_neq_damp": 1.0
+        },
+        "outlet": {
+            "mode": "neq_extrap",
+            "backflow_clamp": true,
+            "blend_alpha": 0.7,
+            "srt_neq_damp": 0.5
+        },
+        "y_wall_bc": "bounce_back",
+        "omega_guard": {
+            "min": 0.01,
+            "max": 1.99
+        }
+    },
+    "cuda": {
+        "threads_per_block": 256,
+        "compute_capability": "auto"
+    }
+}