Solution dialog box — Solution Details

Option	Analysis/Solution Type	Description
Solve Options
Run Directory	all	Controls the name and location of the run directory, where the solver generates input file and output files, including results, messages, warnings/errors, convergence plots, and scratch files.Simulation–Solution Name generates a subdirectory in the working directory and names it with the name of the current simulation followed by a hyphen and the name of the active solution.Solution Name generates a subdirectory in the working directory and names it with the name of the active solution.Current Simulation generates solver files in the same directory as the current simulation. No subdirectory is created.Specify sets the name and location of the run directory.
Run Directory Location	Appears when Run Directory is set to Specify.Specifies the path and folder name for the run directory. You can click to browse to the location.
Solve Thermal	Coupled Thermal-Flow	Lets you specify whether to run the thermal solver.
Solve Flow	Coupled Thermal-Flow	Lets you specify whether to run the flow solver.
Flow Solver Selection	Advanced Flow Advanced Thermal-FlowElectronic Systems CoolingAdvanced Thermal-Flow with ESC	Specifies which flow solver to run. You can choose the serial flow solver or the parallel flow solver.
Parallel Flow Solver Scheme	Appears when Flow Solver Selection is set to Parallel Solver.Specifies the flow solver schemes for the parallel solver.Fully Coupled Pressure-VelocitySolves mass and momentum equations simultaneously for each timestep or steady state iteration. The solver iterates on the pressure and velocity solution until convergence is achieved for each timestep or steady state iteration.Fractional StepSolves mass and momentum equations separately once per timestep or steady state iteration.For more information, see Parallel flow solver schemes.
Turbulence Model	Flow****Coupled Thermal-Flow	Specifies the turbulence model the flow solvers employ for the flow analysis.SST — Shear Stress Transport, K-Omega, and LES — Large Eddy Simulation are available only for advanced licenses.For more information, see Understanding the turbulence models.
LES Subgrid Scale Model	Advanced Thermal-FlowAdvanced FlowAdvanced Thermal-Flow with ESC	Appears when Turbulence Model is set to LES — Large Eddy Simulation.Specifies the model used to approximate the small, subgrid scales.Smagorinsky-Lilly modelAssumes that the energy production and dissipation of small scales are in equilibrium. This is the oldest and most used LES subgrid scale model.WALE modelTakes into account the dissipative effect of the turbulent structures with a high rate of deformation, a high rate of rotation, or both, and reproduces proper asymptotic variation of turbulent viscosity close to the wall. WALE stands for Wall Adapting Local Eddy-viscosity.Vreman modelCaptures the transition of flows from a laminar regime to a turbulent regime.For more information, see LES — Large Eddy Simulation.
Wall Distance Calculation Method	FlowCoupled Thermal-FlowAdvanced Thermal-Flow with ESC****Electronic Systems Cooling	Specifies the wall distance calculation method that the parallel flow solver uses for the turbulence modeling.Geometric SearchComputes the geometric distance between each fluid node and the closest no-slip wall boundary node.Partial Differential EquationComputes the wall distance by solving a Poisson equation on the wall distance function.For more information, see Wall distance calculation methods.
Buoyancy	Flow****Coupled Thermal-Flow	Controls whether the solver includes buoyancy force terms in the analysis. You can specify the buoyancy model as a solver parameter. For more information, see Setting flow solver parameters.Note: If you select Buoyancy, you must define the Gravity Direction on the Ambient Conditions page.
Condensation/Evaporation	Advanced Flow Advanced Thermal-Flow****Advanced Thermal-Flow with ESC	Controls whether the solver calculates the flux of water vapor between a film of water and the humidity of the air. Water cumulation is calculated on thermal elements in contact with the fluid volume.
High Resolution of Flow Features	Flow Coupled Thermal-Flow****Electronic Systems Cooling	Appears when Flow Solver Selection is set to Parallel Solver.Activates the high resolution discretization algorithm to perform a CFD analysis.
Values Outside Time-dependent Tables	all	Lets you control the out-of-bound values for the time-dependent tables.ConstantUses the actual time value and truncates the results when they are out of range of time specified.PeriodicUses the time as a cyclic value and interpolates the results inside the table time range.
Solution Type
Solution Type	all	Lets you define the solution as steady state or transient.
Transient Thermal Loads to Use for Steady State	Thermal Axisymmetric Thermal****Coupled Thermal-Flow	Appears when Solution Type is set to Steady State.Lets you select the method the solver uses to treat any transient thermal loads defined in the solution.Loads at Specified TimeExtracts the thermal boundary condition values for the time case you specify, and uses them as constant values.Average over TimeComputes the time average of all element heat loads and uses them as steady-state boundary conditions. This is useful when the heat loads are periodic.Do Not Use Transient Loads Ignores all defined time-varying boundary conditions for the steady-state analysis.
Use Loads at Time	Appears when Transient Thermal Loads to Use for Steady State is set to Loads at Specified Time.Sets the time at which the thermal boundary condition values are extracted.
Thermostat	Thermal Axisymmetric Thermal****Coupled Thermal-Flow	Appears when Solution Type is set to Steady State.Lets you select the method the solver uses to treat any thermostat modeling objects defined in the solution. See Understanding thermostat options for steady state analyses for more information.
Advanced
Run Job in Foreground	all	Solves the solution in foreground and freezes this software so that you cannot make changes to your model during the solve.Clear this option to be able to access this software while solving the solution.
Parallel Processing
Run Solution in Parallel	Advanced ThermalAdvanced Axisymmetric ThermalAdvanced FlowAdvanced Thermal-FlowElectronic Systems CoolingAdvanced Thermal-Flow with ESCSpace Systems Thermal	Specifies that the solver use parallel processing to run the analysis.You specify the parallel configuration XML file in the Parallel Configuration File box. The parallel configuration file contains a computer list. This is the list of computers that you want to use to run the thermal and flow solvers in parallel. You can browse to an existing file or create a new file. To create or modify a parallel configuration XML file, click Create New File or Modify Existing File, respectively. This launches the Parallel Configuration Tool that allows you to set up the environment for parallel processing.The software infers and stores the path to the file that you specify relative to the Simulation file. If the location of the file changes, the software uses the stored relative path information to try to locate the file. For more information, see Relative path support for external files.The efficiency and scaling of parallel processing using a large number of cores, depends on computer hardware, number of elements and physics in a model. For a better scaling, consider the following guidelines:Request the maximum number of physical cores available in your computer.Avoid using the maximum number of logical cores when you use hyper-threading because threads can compete for the same hardware resources and create a significant slowdown in the solution.For more information, see Parallel processing.
Enable Multithreading	Advanced ThermalAdvanced Axisymmetric ThermalAdvanced Thermal-FlowElectronic Systems CoolingAdvanced Thermal-Flow with ESC****Space Systems Thermal	Enables multithreading where the thermal solver uses shared-memory parallelization in the Analyzer module.The Analyzer module is the module in the thermal solver that calculates steady state or transient temperatures and total pressures for models with thermal and duct elements.You must specify the number of execution threads in the Number of Execution Threads box.To optimize the use of your computer, it is recommended that you set the number of execution threads to the number of cores or processors on your computer. For example, set the number of execution threads to two for dual-core machines or to four for quad-core machines. Multithreading is most-useful for radiation-dominated models.
Material Export
Invalid Material Properties Check	all	Lets you select the type of notice that is generated and the action the software performs if the Model Setup Check and solver detect invalid material properties.ErrorWrites an error message if the Model Setup Check and the solver detect invalid material properties and stops the solve process.WarningWrites a warning message if the Model Setup Check and the solver detect invalid material properties, but the solve process continues. For isotropic, orthotropic, and anisotropic materials, the thermal conductivity (for steady-state and transient analyses) and specific heat (for transient analyses) properties are validated. For fluid materials, for both steady-state and transient analyses, the mass density and dynamic viscosity properties are checked.

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Solution options

Condensation and evaporation

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Solution dialog box — Solution Units

Solution dialog box — Ambient Conditions

Solution dialog box — Initial Conditions

Solution dialog box —Restart

Solution dialog box —Thermal

Solution dialog box —3D Flow

Solution dialog box —Transient Setup

Solution dialog box — Results Options

Solution dialog box (Mapping) — Mapping Details

Solution dialog box (Mapping) — Optional Output

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Solution dialog box — Solution Details, Simcenter 3D 2021.1 Series

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