GT-SUITE Co-Simulation: 1D Coupling

This tutorial demonstrates the typical workflow for co-simulation with the engine simulation code GT-SUITE from Gamma Technologies.

In this tutorial, Simcenter STAR-CCM+ simulates the three-dimensional flow within an intake manifold that forms part of an overall one-dimensional engine analysis modeled in GT-SUITE. The engine analysis simulate a four-cylinder, four-stroke engine running at 3000 rpm on Indolene fuel, including the effect of Exhaust Gas Recirculation (EGR).

During the co-simulation, Simcenter STAR-CCM+ and GT-SUITE exchange the following data:

• species mass fractions
• density (Mass Flow inlet only)
• normal velocity (Mass Flow inlet only)
• pressure (Pressure outlet only)
• mass flow
• temperature

Coupling occurs once per time-step (explicit coupling scheme). Simcenter STAR-CCM+ applies the data imported from GT-SUITE uniformly at the coupled boundary. Before sending data to GT-SUITE, Simcenter STAR-CCM+ averages the three-dimensional fields across a sampling volume, to provide data transition from the three-dimensional to the one-dimensional simulation.

In this tutorial, you obtain initial conditions for the Simcenter STAR-CCM+ simulation from the uncoupled GT-SUITE solution.

During the co-simulation, the GT-SUITE solver runs 20 pre-cycles before transferring data to Simcenter STAR-CCM+, which allows the GT-SUITE model to converge to a periodic steady-state. Once coupling begins, the solvers exchange data every time-step for three more engine cycles.