Solution options

The options that you see in the Solution dialog box depend on the type of solver, analysis, and solution that you select. The options are organized on the following pages.

Solution Details

Lets you specify the run directory, the solution type, and parallel processing. The solution type can be either steady state or transient.

Solution Units

Lets you specify solve-time units that can be different from the units of the current part.

Ambient Conditions

Lets you specify the ambient pressure, fluid temperature, radiative environment temperature, humidity values, tracer fluids, and mixtures of the ambient environment. You can also modify the gravity vector.

Initial Conditions

Lets you specify how the initial conditions of your solution are defined. The initial conditions can be calculated automatically by the solver. You can specify uniform values for each variable separately, or you can use the results from a previous solution as initial conditions.

Restart

Lets you continue a solution that you paused in the Solution Monitor or restart a solution using the results and solver files from a previous solution as the starting point for the iterative solver. You can also specify restart options to selectively run specified thermal solver modules or to selectively reuse the previously calculated data.

Thermal

Lets you specify duct flow parameters, ablation and charring materials, or you can include additional thermal input files. The included input files can be user subroutines or files in the INPF file format.

3D Flow

Lets you specify friction and convection parameters, characteristic length for turbulence models, non-Newtonian fluids, and fluid domain parameters.

Transient Setup

Lets you specify the start time and end time of your transient solution, as well as time integration controls, result sampling, and articulation parameters.

Results Options

Lets you select the output requests you want to recover from the solution. After the solution is complete, you can load the results into the model. Any result set that you selected appears in the Post Processing Navigator, if that result set exists in the solution.

The settings that are most often used are located in Solution Details and Ambient Conditions. Even though the default settings most often produce results, it is a good practice to check the settings on these two pages before every analysis.

You should always review the settings on the other pages when they apply to the model you are solving.

• For a transient analysis, you must specify start and end times in Transient Setup, and review the other settings.

• For a 3D flow analysis with complex flow, settings in 3D Flow can improve meshing, accuracy, and convergence.

• For a large model, deselect unnecessary output requests to improve processing time and reduce results file size.

• When your 3D flow analysis has difficulties converging, you can request flow residuals to find the regions of your model with high residual values. These regions need to be improved.

Output request types

Depending on your solver environment, the analysis type, and the solution type, the groups in the Results Options page let you select specific output request types as well as options to control them. For a list of available output requests, see:

• Thermal output requests

• 3D flow output requests

• Radiation output requests

• Radiative source flux output requests

• Space-related source flux output requests

• 1D flow output requests

Customer defaults

You can set customer defaults to adhere to your company standards and best suit your analyses.

Depending on your solver environment, you can set the following customer default options:

• Run directory and location.

• Solution solve-time units, including a temperature metric and English units.

• Ambient conditions for absolute pressure, fluid temperature, and the radiative environment temperature.

• Output requests.

• Area for internal edges.

Where do I find it?

Application	Pre/Post
Prerequisite	You must specify the appropriate solver.

Editing solution options while creating a solution

Command Finder	Solution
Simulation Navigator	Right-click the Simulation file node→New Solution

Editing solution options while modifying a solution

Command Finder	Solve
Simulation Navigator	Right-click a solution node→Edit
Location in dialog box	(Solve dialog box) Edit Solution Attributes

How do I

Define Advanced Parameters

Define Generic Entities

Learn more

Understanding thermostat options for steady state analyses

Thermal initial conditions

3D flow initial conditions

Understanding ambient conditions

Joining fluid meshes

Understanding the turbulence models

Understanding out-of-bound options for time-dependent tables

Setting turbulence scale values

Turbulence Characteristics

Including additional input files for thermal analysis

Restarting a solution

Understanding time-varying time step

Target Temperature and Target Temperature Change

Solving the model

Look up more details

LES — Large Eddy Simulation

Adaptive time stepping method

Parallel flow solver schemes

Computed quantities for multiple convective BCs

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

Simcenter 3D Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal boundary conditions

Solution options, Simcenter 3D 2021.1 Series

© 2020 Siemens

window.mainLanguage="en_US"

window.delivId=""

window.projectId=""

MathJax.Hub.Config({ TeX: { extensions: ["autoload-all.js"] }, tex2jax: { displayMath: [ ] }, "SVG": { scale: 125 } });