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 Navier-Stokes Equations The motion of a non-turbulent, Newtonian fluid is governed by the Navier-Stokes equation: The above equation can also be used to model turbulent flow, where the fluid parameters are interpreted as time-averaged values. The time-derivative of the fluid velocity in the Navier-Stokes equation is the material derivative, defined as: The material derivative is distinct from a normal derivative because it includes a convection term, a very important term in fluid mechanics. This unique derivative will be denoted by a "dot" placed above the variable it operates on.
 Navier-Stokes Background On the most basic level, laminar (or time-averaged turbulent) fluid behavior is described by a set of fundamental equations. These equations are: The Navier-Stokes equation is obtained by combining the fluid kinematics and constitutive relation into the fluid equation of motion, and eliminating the parameters D and T. These terms are defined below:
 Quantity Symbol Object Units fluid stress T 2nd order tensor N/m2 strain rate D 2nd order tensor 1/s unity tensor I 2nd order tensor 1
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Salary Expectation

8 things to know about the interview question "What's your salary expectation"?

Metal 3D Printing Design Guide

Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.

Mechanical Engineers Outlook

Guide for those interested in becoming a mechanical engineer. Includes qualifications, pay, and job duties.

STEM Career Outlook

Wages, employment opportunities, and growth projections for STEM jobs.