{"artifact_id":"L1-176","layer":"L1","title":"RANS k-epsilon — turbulence closure","domain":"Fluid Dynamics","sub_domain":"Standard k-epsilon RANS","physics_fingerprint":{"L_DAG":3.5,"title":"RANS k-epsilon — turbulence closure","domain":"Fluid Dynamics","carrier":"mechanical","primitives":["L.mean_flow_ns","L.k_eq","L.eps_eq","int.spatial"],"sub_domain":"Standard k-epsilon RANS","noise_model":"gaussian","problem_class":"nonlinear_inverse","solution_space":"reynolds_stress_mean_velocity","difficulty_delta":5,"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_mu_error":0.0,"C_eps_error":0.0,"sigma_k_error":0.0,"wall_fn_error":0.0},"input_format":"measurement_only","problem_class":"rans_kepsilon","forward_operator":"rans_kepsilon_forward","epsilon_fn_center":"20.0"},"omega_bounds":{"H":[32,2048],"W":[32,2048],"Z":[16,1024],"SNR_dB":[0,40],"C_mu_error":[0.0,0.2],"C_eps_error":[0.0,0.3],"sigma_k_error":[0.0,0.3],"wall_fn_error":[0.0,0.3]},"epsilon_bounds":{"psnr_db":[10.0,45.0]},"allowed_problem_classes":["rans_kepsilon"],"allowed_omega_dimensions":["H","W","Z","SNR_dB","C_mu_error","sigma_k_error","C_eps_error","wall_fn_error","C_mu_error","sigma_k_error","C_eps_error","wall_fn_error"],"allowed_forward_operators":["rans_kepsilon_forward"]},"hardness_fn":{"type":"epsilon_fn","delta":5,"kappa":500,"metric":"PSNR_dB"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0x9c0900d0c3b59974796ede94c0737f780bf457a0a52674292a10fca7a79a9a69","chain_tx_hash":"0x37f21bdb20d24bcd165a6cc7bf04062af723aae8607ffa59f82acb9f01589db1","chain_block":41553966}