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Presented work focuses on a problem of iterative thermo-mechanical simulation of a piston for nearly adiabatic high efficiency opposed piston barrel engine. This type of a piston engine has multiple thermodynamic benefits, multifuel potential (petroleum, gasoline, methane, biogas in one engine), lower maintenance and production costs. However it has much higher piston and cylinder liner temperature than conventional multifuel engines. Traditional approach to thermo-mechanical simulations is to calculate the thermal flow only, map the temperature field onto structural model and calculate the resultant deformation field. Authors would like to present the advantages of iterative approach over traditional workflow paying particular attention to the capability of including the impact of the deflected geometry on resulting heat flow and temperature field.