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tribology lubrication hydrodynamic shear heating spring shaft friction turbine lubricant rotary seals simulation hydropower ball bearings reynolds heating journal bearings hl finite elements shear thrust bearing pressure build-up seals tehl pad leakage wear sealing load carrying capacity ehl machinery stern tube seals wear rate comsol multi-body energy hyrodynamics thurst bearing shear stress reciprocating seals roughness lifespan tribosystem static sealing pv-value rotor pressure life bearings thrust bearings gears simulations thin film flow piston rings introduction cloud computing