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Introducing RecurDyn FFlex Thermal - Overview

  • With the newly added thermal analysis functions in RecurDyn FFlex, it is now possible to consider the thermal stress and thermal expansion due to a temperature change within a flexible body.
  • Boundary conditions can also be set to include additional heat transfer effects such as Convection, Heat Generation, or Heat Flux.
  • Supported elements
    • Beam2
    • Shell3, Shell4, Shell9
    • Solid4, Solid5, Solid6, Solid8, Solid10, Solid26

Key Features

1. Material Properties

Introducing RecurDyn FFlex Thermal - Features

  • Thermal Characteristics: The temperature properties for material can be specified in the material Properties window. (Elastic/Isotropic only)
    • Thermal Coefficient (Coefficient of thermal expansion)
    • Reference Temperature (Temperature at which no thermal stress occurs in the material or initial temperature in RecurDyn)
    • Specific Heat
    • Thermal Conductivity

2. Thermal Conductivity Analysis

Introducing RecurDyn FFlex Thermal - Features

  • Nodal Temperature: Defines the temperature condition by entering an Expression for a Node Set.
  • Heat Flux: Defines the amount of heat influx per unit area by entering an Expression for a Patch Set. The area inflow direction can be set to either Up or Down.
  • Convection: It is now possible to select a Patch Set and enter a Heat Coefficient and Ambient Air Temperature to define the amount of surface heat transfer by convection.
  • Heat Generation: Defines the energy generated per unit volume by entering an Expression for an Element Set.

3. Thermal Load

Introducing RecurDyn FFlex Thermal - Features

  • RTL Generation: It is now possible to generate RTL files in CSV file format from the thermal conductivity analysis results of flexible bodies.
  • Thermal Load
    • To calculate the thermal load, the temperature of each node is defined using Expression.
    • Analysis considering the converted thermal load is possible.
    • Applying the RTL file to the thermal load allows an analysis to consider the thermal load without performing a heat transfer analysis.


  • RecurDyn can perform thermal conductivity analysis without using any other software.
  • This allows you to check the effects of thermal expansion and thermal stress of a flexible body when performing multi flexible body dynamics analysis.
  • It is now possible to perform dynamic analysis in consideration of thermal stress on the structure and parts of a system that generates a lot of thermal energy and to improve the design for system operation with reliability and stability.


Example 1. Cooling of Steel Rod

  • Analysis Conditions: Cooling by convection from initial temperature 200°C to 30°C

Introducing RecurDyn FFlex Thermal - Example

Example 2.Hollow Cylinder with Fixed Temperature & Convection

  • Analysis Conditions: Temperature rise due to convection inside cylinder and fixed external temperature condition

Introducing RecurDyn FFlex Thermal - Example


Bimetal Thermometer (Helical Type)

  • Bimetal Thermometer (Helical Type)
    • The helix is fixed on one end and the other end will twist or rotate directly proportional to the temperature change
    • A calibrated gauge with indicator is attached to the rotating end for direct indication of the sensed temperature
  • RecurDyn Modeling
    • Plate Top: Thermal insulation (Steel)
    • Plate Bottom: Thermal insulation (Brass)
    • Left end: Convection
    • Right end: Heat Generation 

Introducing RecurDyn FFlex Thermal Application Bimetal Thermometer