FhSim
3.1.0
Marine systems simulation
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Documentation pages not part of the main user documentation
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Base Overview
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Review issues — fhsim_base
0064 — Cable evaluates the wave sum three times per segment and right-hand side
0065 — Polyplate soil forces allocate on the heap on every right-hand side
Testing report
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Coribo Overview
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Review issues — fhsim_coribo
0001 — WinchableCable has no automated behavioural test of any kind
0004 — The shipped CoriboCable.xml example stops before the first step: cableStates initial conditions are incomplete
0005 — Winch::LoadAttachedGeometryDataFromFile tests an unsigned index for < 0, so the super-element step-back never runs
0006 — Point-versus-disk face contact: the disk's rotational Jacobian has the wrong sign
0009 — ConstraintSolver(double) starts hardware_concurrency threads, which makes small models many times slower; the affinity masks shift past their width
0010 — ConstraintSolver's default thread pool takes every hardware thread and hands each small sub-task over with a condition-variable wake-up
Testing report
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Usage
Review issues — fhsim_environment
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Testing report
Review issues — fhsim_environment
Wakes
Wake parameters
Hydrodynamics: shape and panel load laws
Migrating a downstream project to fhsim 3.1.0
Regression baselines
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Marine_elements Overview
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Review issues — fhsim_marine_elements
0001 — `RbCable/Collision` is registered only in a commented-out line
0003 — `TrawlCable`'s `Heun_i` branch is commented out while `RundDorg`'s is live
0081 — NetCableElementTest still puts sphere and disk mass and weight on the wrong end and splits disk drag as −pos and 1 − pos (Windows only)
0110 — Default load law misses lift at high solidity and the angle dependence of Rudi, Løland and Zhan (A6 disabled tests)
0122 — Sundials BDF with the default linear solver collapses the step in any transient (wake blend, load ramp)
0131 — Default law: replace the two-harmonic angle form with three harmonics, refitted to MF2022, Rudi, Løland and Zhan
0163 — fhsim_aquaculture cannot build on fhsim_marine_elements 4 without a port, and the migration guide does not list what the port must change
0211 — The net file reader is quadratic in the number of panels: every attribute read resolves its path from the root
0314 — RbCable/Cable carries no added mass, so its wave excitation is Froude–Krylov only
0319 — NetStructure's cable drag Jacobian uses the water density, not the element's air/water blend
0354 — WaveHull aliases waves shorter than twice the sample spacing
0027 — Three follow-ups left by the scalar-templated panel force core
0031 — The Windows-only NetStructureTest family (NetStructureTest, NetStructureABAQUS, NetStructureConstrained) has no test coverage
0121 — SimObject.NetStructureWithConstraints_SolverFrequency may be flaky
0223 — Cable/* makes one flow query per element per RHS, each sampling every registered lumped wake
0321 — NetStructureWithConstraints_CablesThreadIndependent no longer runs anything in parallel
0323 — The added-mass Coriolis term uses the element velocity, not the velocity relative to the water
0324 — No test of the MooringCable buoy element in waves
0326 — TrawlCable, MooringCable and RundDorg fix the water density at 1025 kg/m³
0327 — HasJacobians of NetStructure and Disk depends on the contact state of the last OdeFcn call
0328 — NetStructure and NetStructureWithConstraints leak their elements and constraint solver at teardown
0329 — The BottomContact port test does not exercise the M_y and M_z moment terms
0353 — The load-law validation pages are generated from tests that moved to fhsim_environment
Testing report
Net hydrodynamics: methods manual
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Net hydrodynamics: validation report
Validation: MF2022 towed panels (L1-L4)
Validation: Zhan 2006 planar nets and cylinder (L8, S2, W9, S6)
Validation: Rudi 1988 and Løland 1991 (L5, L6)
Validation: Lader 2009 cages (S3, S4)
Validation: towed panel through the SimObject (S1)
Validation: a3/b4 consistency and refit (L9)
Validation: trawl (S7)
Net hydrodynamics: benchmark of load laws and wake evaluation
Net hydrodynamics: downstream check in fhsim_fishery
Migrating to 3.0.0
Trawl net specification (XML)
Regression baselines: review of the 2026-09-27 regeneration (MARE-0099, WP-A12)
Recipe: Analytical Jacobian for NetStructure
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Fishery Overview
Review issues — fhsim_fishery
Testing report
Steady tow of the morenot520 trawl
Attic
Maritime Overview
Bio Overview
Aquaculture Overview
MarEnv
Review issues
Deprecated List
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