{"artifact_id":"L1-178","layer":"L1","title":"Spalart-Allmaras — one-eq turbulence model","domain":"Fluid Dynamics","sub_domain":"Single-eq SA for external aerodynamics","physics_fingerprint":{"L_DAG":3.2,"title":"Spalart-Allmaras — one-eq turbulence model","domain":"Fluid Dynamics","carrier":"mechanical","primitives":["L.mean_flow_ns","L.nu_tilde_transport","L.damping_fn","int.spatial"],"sub_domain":"Single-eq SA for external aerodynamics","noise_model":"gaussian","problem_class":"nonlinear_inverse","solution_space":"nu_tilde_field","difficulty_delta":3,"integration_axis":"spatial","sensing_mechanism":"piv_hot_wire"},"observable_profile":{"metric":"PSNR_dB","regime":"Conditional stability; mismatch parameters dominate at Omega bounds.","secondary":"SSIM"},"size_tiers":{"center_spec":{"omega":{"H":256,"W":256,"Z":128,"SNR_dB":30,"C_b_error":0.0,"wall_error":0.0,"damping_error":0.0},"input_format":"measurement_only","problem_class":"sa","forward_operator":"sa_forward","epsilon_fn_center":"22.0"},"omega_bounds":{"H":[32,2048],"W":[32,2048],"Z":[16,1024],"SNR_dB":[0,40],"C_b_error":[0.0,0.3],"wall_error":[0.0,0.3],"damping_error":[0.0,0.2]},"epsilon_bounds":{"psnr_db":[10.0,45.0]},"allowed_problem_classes":["sa"],"allowed_omega_dimensions":["H","W","Z","SNR_dB","damping_error","C_b_error","wall_error","damping_error","C_b_error","wall_error"],"allowed_forward_operators":["sa_forward"]},"hardness_fn":{"type":"epsilon_fn","delta":3,"kappa":400,"metric":"PSNR_dB"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0x38e139678c0c3b8c84aec6ad5292680de1ca10fc74369f607305c46693179335","chain_tx_hash":"0xbdc793eb065e21591197093d606635e4a4f6e99f1db3262174e2b0e1c9104ef4","chain_block":41553966}