b'Engineer Innovation | MarineFigure 1: The Wrtsil 31 engine holds the Guinness World Record for the most efficient 4-stroke diesel engineThe wide variety of physical models available in Simcenter STAR-CCM+ meant that many different engine components could be analyzed. For example, the team simulated oil splashing within moving engine pistons, using the Volume of Fluid (VOF) model for the oil and overset meshes for the piston motion. Conjugate heat transfer simulations Figure 2: Simcenter STAR-CCM+ is being used to simulate transient gas dynamics in theprovided thermal data which could be complete charge air manifold design mapped on to solid models for stress analysis, and loose fluid/solid coupling small modifications, and these add upwas also used directly in Simcenter to a significant impact on the finalSTAR-CCM+ to model the complete engine design.exhaust manifold. This approach enabled thermal analysis of different Lars Ola admits even he was surprisedcomponents such as bellows and at how much they could simulate usingfastening clamps.SimcenterTM STAR-CCM+TM: I thought it was a joke when one of the guysThe Thermofluids & Simulation team proposed to model the complete chargealso used Simcenter software for the air manifold system with transientin-cylinder combustion analyses: these fluctuations and all. Believe me, that isare vital to ensuring a safe, fuel efficient one big system!engine. Having worked with in-cylinder analysis for many years himself, Lars But this is the kind of idea that comesOla considers Simcenter to be a out of using such an efficient software:powerful tool:the case used 70 million cells but is not even the biggest case we can run now.Thanks to the strong support and Thermal data from the complete chargecollaboration with experts at Siemens, air system was mapped on to solidwe can run a full engine cycle in one models for stress analysis. As well asday with our power licensing. For the this the air cooler intake ducts weredevelopment of the Wrtsil 31 engine, redesigned, which improved flowthe team performed over 660 gas uniformity. combustion simulations and way more 6'