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| names = ["H2", "H", "O", "O2", "OH", "H2O", "HO2", "H2O2", "AR"] | ||
| gas = ct.Solution(sys.argv[2] if len(sys.argv) > 2 else "h2o2.yaml") | ||
| rows = list(csv.DictReader(open(sys.argv[1]))) |
| print(f"mass flow per width inlet {m_in:.6e} outlet {m_out:.6e} kg/(m s)") | ||
| print(f"enthalpy flux drop of the fluid {H_in - H_out:.4f} W/m") | ||
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| rows = list(csv.DictReader(open(a.history))) |
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| def read_tecplot(filename): | ||
| lines = open(filename).read().split("\n") |
FLUID_CANTERA is now available for SOLVER= NAVIER_STOKES and RANS, reusing the general equation of state numerics (general Roe/HLLC, CGeneralAvgGrad_Flow). - CFluidCantera: rho-e (Newton on temperature, shared with the h iteration), P-T, P-rho and rho-T states, frozen-composition derivatives and sound speed. New virtual CFluidModel::SetComposition sets the mixture for state calls without scalar arguments. Turbulent conductivity is added only in the incompressible solver, the compressible numerics add it themselves. - Enthalpy diffusion (storage, per-point terms and edge flux) and the stored mass diffusivities move from CIncNSSolver/CIncNSVariable to CFVMFlowSolverBase/CFlowVariable, used by both regimes. The species enthalpy flux is added to CGeneralAvgGrad_Flow. - CNSSolver passes the species composition to the fluid model, MUSCL reconstruction uses the node compositions, the chemistry is evaluated at the local density and temperature. - Supersonic inlet/outlet use the equation of state and pass the secondary variables for non-ideal fluids. - CConfig: compressible Cantera requires REF_DIMENSIONALIZATION= DIMENSIONAL, ROE or HLLC, and rejects the boundary conditions that assume an ideal gas. Fixes found on the way: - CNumerics::HeatFluxDiffusion and its Jacobian were not initialized, so the boundary viscous numerics could add an undefined energy flux. - CFluidModel::Getdmudrho_T/GetdmudT_rho dereferenced a null viscosity model for fluid models that compute viscosity themselves. - For non-ideal fluids, the supersonic inlet used ideal-gas relations, the general Roe flux at supersonic inlet/outlet read stale secondary variables, and the non-physical reconstruction check used the ideal-gas gamma. New test case combustion/supersonic_h2_channel: autoignition of lean (phi=0.2) premixed H2/air at 1200 K, 1 atm, Mach 2.5. Converged solution agrees with a 1D steady reacting-flow reference (reference_1d.py) within 20 K and 1.4% in pressure downstream of ignition; ignition is 8 mm early on the 1 mm grid and the gap halves with the grid spacing. The mesh is in the Testcases repository. Unit test Fluid_Cantera_Compressible checks the state round trips and the derivatives against finite differences. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…sfer tests - CFluidCantera: SetTDState_hs (temperature from h, pressure from the ideal gas entropy relation) and SetTDState_Ps (Cantera setState_SP). BC_Riemann sets the composition of the boundary node, Riemann markers are allowed. - LowMachPrimitiveCorrection takes the edge compositions, LOW_MACH_CORR is allowed with the compressible Cantera model. - Isothermal and heat-transfer walls use the temperature derivatives of the secondary variables for non-ideal fluids. - Fix: the flow under-relaxation divided the static energy change by the static energy, which is negative with the formation energies of Cantera and froze the solution. Non-ideal fluids scale it by rho*cv*T = P*rho/(dP/de). - Fix: FLUID_CANTERA defaults to INIT_OPTION_INC= OPERATING_PRESSURE like the other mixture models; the incompressible slit burner cases ran at 115 and 137 kPa instead of THERMODYNAMIC_PRESSURE. New test cases in combustion/channel_heat_transfer (laminar planar channel, O2/N2, Riemann inlet/outlet): - isothermal wall, Nu = 7.40-7.61 against 7.541 (Shah & London); - uniform heat flux, Nu = 8.26-8.31 against 8.235; - Mach 0.01 with LOW_MACH_CORR, mass flow 0.65% from the incompressible solver; - conjugate heat transfer with a solid wall, fluid enthalpy drop, wall heat flux and heat through the solid agree within 0.3%. supersonic_h2_channel_mg.cfg runs the supersonic case with two multigrid levels, equal to the single grid solution within 5e-5 K. Five regression entries added. The meshes are in the Testcases repository. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…Cases repository Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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…ike the other Cantera tests Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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