The notion of a deformable continuous medium comes to mind when we observe the kind of solid deformations shown in Figs. 1 and 2, during cold or hot forming processes, or again the flow of a liquid, or the expansion and compression of a gas. From this kind of experience, the observer extracts the idea that certain problems can be treated on a macroscopic scale by assimilating the material to a ‘continuous’ medium, without in any way contradicting the assumptions of microscopic physics.
KeywordsScale Model Validation Frame of reference Coordinate system Configuration Lagrange Euler Velocity Continuity Material element Pathline Streamline Streakline
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