Editor:  Yanhua Zhao

  Page 2 Thermal Analysis LS-DYNA

The following example shows LS-DYNA applied to a coupled thermal-structural analysis of a welding process. Heat is applied to a block of material through a moving weld source. LS-DYNA uses the Goldak weld model. In this model, the weld beam parameters are defined by a non-symmetric heat flux distribution. The weld beam motion is defined by the beam aiming direction and the beam's velocity vector. This shows clearly in the animation as a red "tail" of high temperature which trails the weld source.

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Numerous industrial applications are complicated to model and are only possible with coupled fluid-thermal-mechanical analysis such as Casting. The analysis code must be able to model the hot liquid metal as it fills a mold, its subsequent solidification and shrinkage on cool down, and predict the final dimensions of the cast part. This is important in the manufacturing of automobile engine blocks, cylinder heads, and other engine cast components

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LS-DYNA couples thermal and structural analysis through coupled constitutive models; the user may select thermal elastic and viscoelastic materials for such an analysis. LS-DYNA additionally provides compressible and incompressible fluid dynamics analysis capabilities.