b'Marine | Engineer InnovationThe maritime industry is one of theThe Wrtsil 31 (W31) is a medium mainstays of the global economy:speed 4-stroke engine, designed for use around 90 percent of the worlds tradeas either a main propulsion engine or involves shipping, while the cruise andan auxiliary engine. It can run as either leisure industry is a growing revenuea diesel, dual fuel or spark-ignited gas generating stream across the globe.engine.Development took five years, Shipping is recognized as the moststarting in 2010, and Lars Ola and his efficient form of commercial transport,team were involved from the earliest with the lowest CO2 emissions perpart of the engine design process. We tonne of cargo transported. Theknew our customer requirements from enormous scale of the industry,internal stakeholders, so we aimed to however, means that it is still amake a new engine to replace existing significant contributor to the worldsmodels but also be of benefit to new CO2 emissions. The maritime industry iscustomers. The new design had to be working hard to reduce itsfuel efficient and meet all regulatory environmental impact, with new, stricterrequirements. Wrtsil also decided to emission regulations coming into forceuse a modular design, making it easier in the coming years. Ship manufacturersto change parts and assemblies: small and engine designers need to respondsize modular engines have been in use to these new rules and come up withfor a while, but no other engine of this new, efficient designs quickly. And if yousize uses this kind of modular want to reduce emissions then you startapproach.with the source: the engine. Wrtsil is one of the biggest ship engineContribution of Simulation to engine manufacturers and servicing agents indesignthe world - one in three ships. To stayThe Thermofluids & Simulations team ahead of the competition they arehave used Simcenter software as part of always innovating and developing. Theythe engine design process since the are committed to sustainability, with anyear 1999. Simcenter is used for both overriding focus on ensuringcomputational fluid dynamics (CFD) and profitability, providing environmentallyinternal combustion (ICE) analyses. This sound products and services whilewas the first time however that CFD had ensuring responsible business conduct. been used so early in the design process: Lars Ola and his team ran initial The Wrtsil 31 diesel engine, releasedsimulations on potential designs even in 2015, has been awarded the accoladebefore the W31 3D Computer aided of Most Efficient Diesel Engine by thedesign (CAD) was completed. We Guinness book of world records. This islooked at potential new system features due to its diesel fuel consumption beingfor combustion on existing engine as low as 165 g/kWh, far lower than anygeometries. This gave us great freedom other 4-stroke diesel engine currentlyto try new things, as we could make available on the market.Its exceptionalmistakes virtually rather than creating fuel efficiency is made possible throughexpensive prototypes. the use of new technologies, including 2-stage turbocharging, a high-pressureThe scope of the CFD contribution to fuel injection system and adjustablethe project was not pre-defined. As the valve actuation, with a next-generationengine design evolved, CFD was used engine control system. We sat downfor analysis of more parts of the engine, with Lars Ola Liavg, manager of theincluding the complete charge air and Thermofluids & Simulations team toexhaust manifold systems. Looking at find out more about this amazingthe finished engine, Lars Ola comments engine, and how multidisciplinaryYou can go round the whole engine design simulation using Simcenter hasand point out here we have simulated, helped Wrtsil to create this innovativehere we have simulated, here we have engine. simulated. CFD helped make many 5'