Draft for Information Only ContentFluid Motion Fluid MotionThe fluidity property of fluid makes the motion of fluid very complex. The velocity variation of each fluid particle during fluid flow within the velocity field caused by forces results fluid element deformation. The deformation of fluid is similar to that of solid except fluid deforms continuously and therefore express in terms of rate of deformation or strain rate. Types of fluid motion and deformation are translation, linear deformation, rotation, and angular deformation. Linear TranslationThe linear translation of a fluid element in a small time interval with same field velocity along the flow direction, for example in xy plane Linear DeformationThe linear deformation of a fluid element in a small time interval with field velocity gradient along the flow direction, for example in xy plane Linear Strain RateThe linear strain rate or the rate of change of length per unit length along one of the flow direction can be expressed as Let , the volumetric strain rate or the bulk strain rate is then Angular RotationWhen there is a cross flow velocity gradient along the flow, the fluid element will rotate, for example in the xyplane, Angular DeformationIn a small time interval, the angular deformations of the fluid element, for example in the xyplane. Therefore for small angles, and Angular Strain RateThe angular strain rate or the rate of shear strain by definition can be expressed as and in terms of strain rate tensor ©sideway ID: 100200003 Last Updated: 2/10/2010 Revision: 1 
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