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Renormalized molecular dynamics (RMD) method, our new development, allows not only simulation of the flow fields on an arbitrary scale but also simulation of rarefied flow, which has been only simulated by means of the DSMC method. The RMD method offers simulations over the region of all Knudsen numbers. Since the RMD method has all the advantages of the MD method, it can reproduce the phenomena ac?companying phase transition and compression and is applicable to even the coupled problem between flow and thermal fields. This paper reports the study results obtained by the RMD method, which is applied to the coupled problem between flow and thermal fields and the free expansion problem. The simulation for the convective heat transfer on a flat plate surface placed in parallel to the flow provides the relationship between Nusselt number and Reynolds number, and the relationship shows a good agreement with the approximate expression. The simulation re-sults of the free expansion problem completely agree with the analytical solution, proving that the RMD method can simulate unsteady flows in high Knudsen numbers.
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