b'Marine | Engineer Innovationthan 1,200 diesel combustion simulations. These helped us optimize the piston geometries, fuel injector specifications and operating parameters for the engine. This was the first time that a Wrtsil engine family had been developed in both diesel, gas, and dual-fuel versions already from the outset, and these advanced CFD analyses helped ensure the design was optimized for both diesel and gas fuel operation. Inlet and exhaust ports were also optimized using CFD, and so were many critical components such as the prechambersFigure 3: Complex physics like oil splashing with moving engine piston require sophisticated high fidelity modeling approaches, here Volume of Fluid method on overset moving meshof the gas engine version.Cross-company collaborationWhile the Thermofluids & Simulation team are the main users of CFD simulation, Lars Ola notes that use is becoming more widespread throughout the company. Engine design engineers are now using embedded CFD within NX, their CAD tool, to analyze flowTemperature (C)through engine components from theVelocity: Magnitude (m/s)very first design. Lars Ola supports thisFigure 4: Fully embedded loose fluid/solid coupling approach for thermal analysis of e.g. the CAE democratization: Involving basicexhaust manifoldCFD as part of the CAD design process means we receive fewer bad designs which we have to reject: it reduces thenow use Simcenter STAR-CCM+ to build virtual scrap rate. The Thermofluids &some of their conjugate heat transfer Simulation team also worked closelymodels.with the structural analysis team to create a thermal management analysisWith this increased use of simulation process based on conjugate heatsoftware, efficient use of computing transfer (CHT) simulations and in- resources is a priority. Wrtsil have one cylinder CFD. As part of this project,of the biggest computer clusters in also Finite Element (FE) engineers canFinland: this capacity is used for both FE 7'