Solution dialog box (Multiphysics), Solution Control page

Structural Control
Appears when Analysis Type is Structural, Coupled Thermal-Structural, Coupled Flow-Structural, or Coupled Thermal-Flow-Structural.
Title	Lets you specify a title for the solution.
Subtitle	Lets you specify a subtitle for the solution.
System Cells	Specifies the system cells written to the NASTRAN statement in your input file.Select an existing system cells modeling object from the list or click Create Modeling Object to create a new one.Click Edit to edit the selected modeling object.See System Cells dialog box (Nastran/Multiphysics) for more information.
Bulk Data Echo Request	Controls the printout of bulk data.For more information, see ECHO.
Geometry Check	Controls the element quality threshold values used in Nastran's optional element quality checks.DefaultDoes not write the GEOMCHECK command to the Executive Control section of your Nastran input file. With Default, Nastran uses its default element quality thresholds to evaluate the elements at the time of the solve.NONEWrites a GEOMCHECK NONE statement to the Executive Control section of your Nastran input file. If you select NONE, Nastran does not perform any of its optional element quality checks.User DefinedLets you specify a Geometry Check Options modeling object that overrides specific quality values. See Specifying Nastran GEOMCHECK options for more information.
Geometry Check Options	Available if Geometry Check is set to **User Defined.**Lets you specify a Geometry Check Options modeling object for the solution.
Rigid Body Checks	Lets you specify a Rigid Body Checks modeling object for the solution. A Rigid Body Checks object lets you specify options that control how the software checks the motion grounding and mass reduction of rigid bodies in your solution.For more information, see Checking for unintentional grounding and mass reduction.
Rigid Element Method	Selects the rigid element processing method for RBAR and RBE2 elements.For more information, see RIGID.
Nonlinear Control Parameters	Lets you specify a Nonlinear Control Parameters modeling object for the solution. A Nonlinear Control Parameters lets you specify options that control the iteration strategy for the solution. You can also specify a Nonlinear Control Parameters modeling object at the solution step level.For more information, see NLCNTL.
Global Contact Parameters	Lets you define additional parameters to control the Simcenter Nastran contact algorithm.For more information, see Defining parameters for contact conditions (Simcenter Nastran).
Global Glue Parameters	Lets you specify additional options to control the Simcenter Nastran glue algorithm.For more information, see Defining parameters for glue conditions.
Structural Solution Parameters	Lets you specify a Structural Solution Parameters modeling object for the solution. A Structural Solution Parameters lets you specify additional parameters to use in your solution. Parameters are used extensively in Nastran solution sequences for input of scalar values and for requesting special features.For more information, see Specifying parameters for Nastran analyses
Large Displacements	For all nonlinear element types that have a large displacement capability, controls whether Nastran assumes they have large displacement effects (updated element coordinates and follower forces).For more information, see PARAM,LGDISP.
Material Nonlinearity	Enables plasticity or creep effects in the solution. You must select this option for plasticity or creep effects to exist anywhere in the solution. If this solution option is selected, you can separately control creep and plasticity in each solution step using the Nonlinear Control Parameters modeling object. You can also disable the creep and plasticity effects for individual elements or for physical property tables using the Material Override simulation object.For more information, see PARAM,MATNL.
Ignore Material Temperature Dependence	When this option is selected, temperature dependencies are not exported with the MATTi bulk entries. Instead, properties are evaluated at the material reference temperature (if specified) or at 0.0.
Export Nodes Connected Only to Flow Elements	Controls whether the software exports nodes that are associated with flow elements only when you export or solve the solution.Select this check box to export the nodes to the solver input file.Clear this check box to prevent the software from exporting the nodes for these element types to the solver input file. The software issues a message in the diagnostics file that indicates the number of nodes that are not exported.For more information, see Controlling the export of nodes connected to flow elements.
Augmented Time Step List	Available when Analysis Type is Structural. Lets you create an Augmented Time Step List modeling object for the solution.With Simcenter 3D Multiphysics, you can create structural solutions in which the temperatures are mapped from a thermal solution. The thermal solution may use automatic time stepping, so the time spacing is uneven. If you are concerned with solving the structural solution at the time points from the thermal solution, you must add these time points. You can import this uneven list of time points into the structural solution directly from the thermal results, so that Simcenter Nastran solves at the same time points as the thermal solution (along with any time points you specify in the structural solution).You can import these additional time points from a Simcenter Nastran, Simcenter 3D Thermal, Abaqus, or ANSYS results file that contains transient results. If you want to subdivide the additional time points, you can specify a number of increments. You can also specify at what point the solver should output data (for example, at the solution step end time or at each time step increment).You can also import time points from a CSV file. For more information, see Adding time points to a structural solution to match a reference solution.When you solve, the software writes the additional time points to the TSTEP1 bulk data entry.
Thermal Control
Appears when Analysis Type is Thermal, Coupled Thermal-Structural, Coupled Thermal-Flow, or Coupled Thermal-Flow-Structural.
Thermal Solution Parameters	Specifies the Thermal Solution Parameters modeling object to adjust thermal and radiation solver parameters.Select a Thermal Solution Parameters modeling object from the list, or to create the object, click Create Modeling Object . After you select a modeling object, use Edit to modify it.Click More Options to search and filter modeling objects. The following options are available.FindLets you search for an object by entering the full name of the object. For example, to find a region named ABC_region, type ABC_region in the search box and press Enter or click Find . If the object is found, it will be selected automatically.Filter by NameLets you filter the list by the names of the objects. This filter supports wildcards. The default wildcard is the asterisk (), and it displays all entries in the list. For example, to filter the list to display every object with a name starting with the letter “a," enter a as the filter string.Filter by LabelLets you filter the list by the label of the objects.
Steady State Thermostat	Specifies the thermostat treatment for all steady state steps. Sink to Average TemperatureConstrains the heater elements to the average of the set point temperatures specified on the corresponding sensor. Proportional Heat LoadCreates a linear ramped heat load between the set point temperatures. For more information, see Understanding thermostat options for steady state analyses.
Ablation–Charring Material	Lets you include one or more Ablation–Charring modeling objects in the solution. The number of included Ablation–Charring objects appears in parentheses.
Flow Control
Appears when Analysis Type is Flow, Coupled Flow-Structural, Coupled Thermal-Flow, or Coupled Thermal-Flow-Structural.
Flow Solution Parameters	Specifies the Flow Solution Parameters modeling object to adjust flow solver parameters.Select a Flow Solution Parameters modeling object from the list, or click Create Modeling Object to create the modeling object. After you select a modeling object, use Edit to modify it.
Flow Solver Scheme	Specifies the flow solver scheme for the parallel solver used by Simcenter 3D Flow in the Multiphysics environment.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	Specifies the turbulence model the flow solver employs for the flow analysis.For more information, see Understanding the turbulence models.
Characteristic Length Scales	Appears when Turbulence Model is set to Mixing Length.Specifies how the characteristic length scales for the mixing length turbulence model are computed.AutomaticComputes the characteristic length scale need by the mixing length turbulence model using the fluid domain volume and surface area in the model.SpecifyLets you specify the values for the eddy length scale and the mean flow velocity in the Characteristic Length Scale and Fixed Viscosity Mean Flow Velocity Scale boxes, respectively.
LES Subgrid Scale Model	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	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.
Flow Surface Parameters	Specifies the Flow Surface Parameters modeling object to adjust global flow surface parameters.Select a Flow Surface Parameters modeling object from the list, or click Create Modeling Object to create the modeling object. After you select a modeling object, use Edit to modify it.
Buoyancy	Includes buoyancy force terms in the analysis. You can modify the buoyancy model in the Flow Solution Parameters modeling object. For more information, see Setting flow solver parameters.Note: Because buoyancy force terms include gravity vector, you must define a Gravity load.
Condensation/Evaporation	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	Activates the high resolution discretization algorithm to perform a CFD analysis.
High Speed Flow	Activates solver equations to include high speed flow terms. The solver uses the total energy equation to handle subsonic, transonic and supersonic flow regimes. The solver does not support hypersonic flow regime. Depending on the flow speed and the effects you want to model, you may need to set a very small time step in the Flow Solver Parameters modeling object.Note: High speed flows are not supported by the fractional step flow solver scheme.
Non-Newtonian Fluid	Specifies that a defined fluid material has the non-Newtonian properties you specify in a Non-Newtonian Fluid modeling object. You can include as many non-Newtonian fluids in the simulation as you want.
Coupled Control
Appears when Analysis Type is Coupled Thermal-Structural, Coupled Flow-Structural, Coupled Thermal-Flow, or Coupled Thermal-Flow-Structural.
Coupled Solution Parameters	Lets you specify a modeling object that specifies coupling parameters between the different solvers.Select an existing modeling object from the list or click Create Modeling Object to create a new modeling object. After you select a modeling object, use Edit to modify it.For more information, see Define coupled solution parameters.

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Solution dialog box (Multiphysics), General page

Solution dialog box (Multiphysics), Solution Units page

Solution dialog box (Multiphysics), Ambient Conditions page

Solution dialog box (Multiphysics), Initial Conditions page

Solution dialog box (Multiphysics), Articulation Parameters page

Solution dialog box (Multiphysics), Results Options page

Solution dialog box (Multiphysics), Mapping Details tab

Solution dialog box (Multiphysics), Restart Management page

Solution dialog box (Multiphysics), Solution Control page, Simcenter 3D 2021.1 Series

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