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# hydodynamics

الكلية كلية الهندسة     القسم  الهندسة البيئية     المرحلة 2
أستاذ المادة نسرين جاسم حسين المنصوري       06/11/2014 16:38:50
A continuum is said to be in equilibrium, if the resultant of the forces, acting on every arbitrary part of the volume vanishes. The forces are called surface, volume, and inertia forces, as their magnitude is proportional to the surface, volume, or mass of the part of the continuum
considered. The surface forces act normal to the surface, as long as the fluid is at rest. The corresponding stresses (normal force per surface element) are – after Euler (1755) – called fluid pressure or abbreviated pressure. The equilibrium condition is derived for an arbitrarily chosen triangular prismatic volume element. For the surface forces to be in equilibrium, the sum of the vertical and horizontal components must be equal to zero. If the forces per unit area, the pressures on the surface, are denoted by p1, p2, and p3, then the forces can be written as products of the pressures and the areas, on which they act.The following sketch shows the prismatic element with the surface forces indicated. If another geometric shape of the volume element would have been chosen, the equilibrium condition would always require the vanishing of the sum of the vertical and horizontal components of the surface forces.
but fluid motion submitted to two method of description: lagrangain method and Eulerian method

المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .