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Draft. This manual is new and still being checked against the software as it is verified. Some pages will change. If something here does not match what you see, the software is right — tell us and we will fix the page.

Models

The Models panel open beside the setup tree, showing the Analysis, Turbulence, Physics and Derived sections.

Where it is

Section titled “Where it is”

Setup tree: Models

Controls

Section titled “Controls”

Analysis

Section titled “Analysis”

Analysis type

Section titled “Analysis type”
  • Control: choice (ComboRow)
  • Default: Incompressible
  • Bound to: CaseState.analysisType
  • Options: Incompressible, Compressible, Convective Heat Transfer, Conjugate Heat Transfer, Multiphase (VoF), Multiphase (Euler-Euler), Particles (Lagrangian), Combustion / Reacting, Atmospheric & Wind, Marine & Waves, Scalar transport, Cavitation, Supersonic / shock, Solid conduction, Compressible multiphase, Miscible mixing, Sediment / drift flux, Shallow water, Free surface (potential), Premixed combustion, Spray, Solid stress, Electrostatics, Magnetostatics, Magnetohydrodynamics, Rotating frame (SRF), Molecular / rarefied
  • Writes: controlDict/application

The in-app guidance depends on the case:

  • Mach < 0.3, density variation negligible.
  • Particles rather than fields. No velocity, no pressure, no turbulence model - the Molecular step replaces Materials, Initial conditions, Boundary conditions and Numerics.
  • See the Create Simulation dialog for the full description.

Time dependency

Section titled “Time dependency”
  • Control: choice (ComboRow)
  • Default: Steady-state
  • Bound to: CaseState.timeDependency
  • Options: Transient, Steady-state (from either branch of CaseState.transientOnly``)
  • Writes: fvSchemes/ddtSchemes

This analysis has no steady form - the solver integrates in time.

Algorithm

Section titled “Algorithm”
  • Control: choice (ComboRow)
  • Default: SIMPLE
  • Bound to: CaseState.algorithm
  • Options: SIMPLE, SIMPLEC, PIMPLE, PISO (from either branch of CaseState.steady``)
  • Writes: fvSolution/…

Turbulence

Section titled “Turbulence”

Model

Section titled “Model”
  • Control: choice (ComboRow)
  • Default: k-omega SST
  • Bound to: CaseState.turbulenceModel
  • Options: Laminar, k-epsilon, realizable k-epsilon, RNG k-epsilon, k-omega, k-omega SST, k-omega SST LM, GEKO, EBRSM, Spalart-Allmaras, LRR (RSM), SSG (RSM), LES WALE, LES Smagorinsky, SA-DDES, SST-IDDES
  • Writes: turbulenceProperties/RAS/model

Wall treatment

Section titled “Wall treatment”
  • Control: choice (ComboRow)
  • Default: Wall functions
  • Bound to: CaseState.wallTreatment
  • Options: Wall functions, Resolved (low-Re), Automatic blending

Selects a coherent set across nut, k, omega and alphat.

Physics

Section titled “Physics”

Energy equation

Section titled “Energy equation”
  • Control: on/off (ToggleRow)
  • Default: false
  • Bound to: CaseState.energyEnabled

Gravity / buoyancy

Section titled “Gravity / buoyancy”
  • Control: on/off (ToggleRow)
  • Default: false
  • Bound to: CaseState.gravityEnabled

Surface tension

Section titled “Surface tension”
  • Control: value (ValueField)
  • Unit: N/m
  • Default: 0.07
  • Bound to: CaseState.surfaceTension
  • Writes: transportProperties/sigma
  • Shown when: CaseState.analysisFamily === "fluids" && String(CaseState.solver).indexOf("inter") >= 0

Between the two phases. 0.07 N/m is water against air at 20 C.

Problems reported against this step

Section titled “Problems reported against this step”

The application checks these before a run and reports them in the Problems tab against this step.

Severity Message
error …
error …
error … has no steady form. … integrates in time; set Time dependency to Transient.
info The ignition kernel (… mm) is narrower than two mesh cells, so it is written … mm wide: the flame-wrinkling transport equation diverges on a spark that fits inside one cell. Refine the mesh if the kernel size matters.
error A two-phase case needs gravity. Without it there is nothing to separate the phases and the interface will not settle.
error … has no turbulence model, so it will not read k, omega or nut. Set the turbulence model to Laminar, or choose a solver that has one.
error … has no steady form. Set the time dependency to Transient.
error … has no transient form. Set the time dependency to Steady-state.
warn … needs …, which this app does not write. Add it to the case directory before running.
warn … cannot be set up completely by this build: it needs …. The case will be written and the mesh will build, but the solver stops at start-up.
warn This build of the equilibrium stress solver does not converge - the correction it computes points away from equilibrium, and the run ends on a floating-point trap whatever the acceleration factor. Displacement solves the same steady problem on this case, because the time scheme here is already steady, and it converges.
error … is not part of the … tier. The case is safe and nothing has been lost - choosing another analysis type, or upgrading, will let it run.
warn Gravity is off for a buoyancy-sensitive analysis type.

… marks a value the application computes at run time, so the source carries no fixed text for it.