Multiphysics Simulation using Implicit Sequential Coupling

In an expanding range of applications, engineers must be able to accurately predict how complex products will behave in real-world environments where multiple types of coupled physics interact. Multiphysics simulation is becoming crucial in the product design process for a rapidly growing number of companies and has the potential to influence most engineering simulation efforts in coming years.

This presentation focused on implicit sequential coupling, which couples multiple single physics into one unified multiphysics simulation. With implicit sequential coupling, multiphysics problems are solved by solving each physics discipline sequentially. Results from each individual solution are passed as loads from one physics discipline to another, with convergence between the individual disciplines obtained at each point during the solution. The robust convergence behaviour of implicit sequential coupling ensures accuracy and improves solution efficiency.

A wide variety of coupled-physics problems can be solved by employing implicit sequential coupling. Examples include thermal-structural coupling, thermal-electromagnetic coupling, electromagnetic-structural coupling, and fluid structure interaction (FSI). Many products including; micro-electromechanical systems (MEMS), electronic devices, and elastic artery modelling for stent design require a multiphysics solution and can utilise implicit sequential coupling.

The presentation highlighted a number of real-world examples and customer applications to demonstrate the industry applications of this technology. Panellists were available at the end of the presentations to address any questions about implicit sequential coupling, fluid structure interaction, and multiphysics solution technology.

Fluid Structure Interaction of Gas Turbine Exhaust Ducts

Ødegaard & Danneskiold-Samsøe A/S has performed a coupled-field analysis to study the effects of flow-induced vibrations on thin-walled structures such as gas turbine exhaust ducts. These vibrations have been caused by either external vortex sheet separation or internal flows with large regions of separation. The presentation focus edon the methodology to obtain and transfer these pressure fluctuations from the flow field solution to the structural simulation.

ØDS is a consulting firm; owned by Lloyd’s Register, with headquarters in Copenhagen, Denmark. The firm assists clients with troubleshooting, verification analysis, and measurements within the key areas of Oil and Gas, Marine, and Noise and Vibration.