Multiphysics

Adding time points to a structural solution to match a reference solution

You can use the Augmented Time Step List modeling object to import time points from a thermal solution into Simcenter 3D Multiphysics structural solutions.

With Multiphysics, you can create structural solutions in which the temperatures are mapped from a thermal solution. If the thermal solution used automatic time stepping, the time stepping is uneven. If you want to solve the structural solution at the same time points as those specified in the thermal solution, you must add those time points to the structural solution. To do this, you can import the uneven list of time points from the thermal results into the structural solution. Simcenter Nastran then solves the structural solution 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. The format must be TEND,NINC,NOUT, where:

TEND is the end time (real number ≥ 0)
TINC is the number of increments (integer >0)
NOUT specifies when the software should output data. You can enter any of these values:YES to output at each increment.END to output at the solution step end time.ALL to output at all solution times.An integer ≥ 0 to define a skip factor.

You associate the Augmented Time Step List with the solution in the Solution dialog box on the Solution Control page.

When you solve, the software writes the additional time points to the TSTEP1 bulk data entry in the Simcenter Nastran input file.

Example

The following Simcenter Nastran input file shows the time points in the structural solution, before adding the augmented time step list.

This example shows additional time points imported from a Simcenter 3D Thermal .bun file with the augmented time step list.

Where do I find it?

Augmented Time Step List modeling object

Application	Pre/Post
Prerequisite	A FEM or Simulation file as the work part and displayed partSimcenter 3D Multiphysics as the specified solverStructural or Coupled as the specified analysis type
Command Finder	Modeling Objects
Location in dialog box	Type→Augmented Time Step List

Augmented Time Step List option

Application	Pre/Post
Prerequisite	A FEM or Simulation file as the work part and displayed partSimcenter 3D Multiphysics as the specified solverStructural as the specified analysis type
Simulation Navigator	Right-click the Simulation file and choose New Solution
Location in dialog box	Solution Control page

How do I

Define coupled solution parameters

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Simcenter 3D Multiphysics overview

Mapping results data to another model in Simcenter 3D Multiphysics

Two-way fluid-structure interaction

Defining multiphysics solution steps

Controlling time steps in a coupled solution

Requesting structural output for Simcenter 3D Multiphysics

Requesting thermal, flow, and thermal-flow output for Simcenter 3D Multiphysics

Previewing Multiphysics solver syntax

Analyzing multiphysics results

Controlling the export of nodes connected to flow elements

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