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Article:Fluid
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(Modelling)
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Solids can be subjected to shear stresses, and to [[normal stress]]es—both [[Compressive stress|compressive]] and [[Tensile stress|tensile]]. In contrast, ideal fluids can only be subjected to normal, compressive stress which is called [[pressure]]. Real fluids display viscosity and so are capable of being subjected to low levels of shear stress.
 
Solids can be subjected to shear stresses, and to [[normal stress]]es—both [[Compressive stress|compressive]] and [[Tensile stress|tensile]]. In contrast, ideal fluids can only be subjected to normal, compressive stress which is called [[pressure]]. Real fluids display viscosity and so are capable of being subjected to low levels of shear stress.
   
===Modelling===
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{{main|Fluid mechanics}}
 
In a solid, shear stress is a function of [[Strain (materials science)|strain]], but in a fluid, [[stress (physics)|shear stress]] is a function of [[strain rate]]. A consequence of this behavior is [[Pascal's law]] which describes the role of [[pressure]] in characterizing a fluid's state.
 
 
Depending on the relationship between shear stress, and the rate of strain and its [[derivative]]s, fluids can be characterized as one of the following:
 
*[[Newtonian fluid]]s : where stress is directly proportional to rate of strain
 
 
*[[Non-Newtonian fluid]]s : where stress is not proportional to rate of strain, its higher powers and derivatives.
 
 
The behavior of fluids can be described by the [[Navier–Stokes equations]]—a set of [[partial differential equations]] which are based on:
 
* continuity ([[continuity equation#Fluid dynamics|conservation of mass]]),
 
* conservation of [[linear momentum]],
 
* conservation of [[angular momentum]],
 
* [[conservation of energy]].
 
 
The study of fluids is [[fluid mechanics]], which is subdivided into [[fluid dynamics]] and [[fluid statics]] depending on whether the fluid is in motion.
 
   
 
==See also==
 
==See also==
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