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+# ANSYS Fluent Guide — ASTERION V0.6
+
+## Cabin sector
+
+1. Import the enclosure and obstruction STLs into SpaceClaim or Fluent Meshing.
+2. Create a watertight internal fluid volume and named supply, return, crew, equipment and wall boundaries.
+3. Use pressure-based coupled or SIMPLEC initially; enable energy and species transport.
+4. Represent CO₂ as a dilute species in air.
+5. For the rotating habitat case, use a rotating reference frame of 4.3 rpm about the spacecraft X-axis and confirm the radial acceleration direction.
+6. Apply nominal 240 m³/h total supply, 291 K inlet temperature and 420 ppm CO₂.
+7. Apply two 100 W crew heat sources, 600 W equipment heat, and total crew CO₂ generation of 40 L/h.
+8. Monitor outlet mass flow, species balance, maximum CO₂ and occupied-zone values.
+9. Compare the well-mixed nominal level with **587 ppm**, but expect local Fluent maxima to be higher.
+
+## Skimmer
+
+1. Import `skimmer_lifting_body_cfd_surface.stl` and create a half-model far field.
+2. Place inlet/far-field boundaries at least 10 body lengths upstream and radially, and 20 lengths downstream for initial verification.
+3. Use compressible air and the energy equation. Start with SST k-omega.
+4. Use the static atmospheric properties in `skimmer_boundary_conditions.csv`.
+5. Set reference area to 24 m² and reference length to 8 m.
+6. Run -5°, 0°, 5°, 10° and 15° angle-of-attack cases.
+7. Record CL, CD, Cm, L/D, residual histories and force-monitor stability.
+8. At Mach 0.8 and Mach 2.0, refine shocks using density-gradient adaptation if cell limits permit.
+
+## Convergence and quality
+
+- global mass imbalance below 0.5%;
+- energy imbalance below 1% when energy is active;
+- stable force monitors, preferably below 0.5% variation over the final iterations;
+- mesh-independent CL within 2% and CD within 5%;
+- document y-plus and wall-treatment compatibility.