enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Reynolds equation - Wikipedia

    en.wikipedia.org/wiki/Reynolds_Equation

    The equation can either be used with consistent units or nondimensionalized. The Reynolds Equation assumes: The fluid is Newtonian. Fluid viscous forces dominate over fluid inertia forces. This is the principle of the Reynolds number. Fluid body forces are negligible.

  3. Dynamic similarity (Reynolds and Womersley numbers)

    en.wikipedia.org/wiki/Dynamic_similarity...

    The Reynolds and Womersley Numbers are also used to calculate the thicknesses of the boundary layers that can form from the fluid flow’s viscous effects. The Reynolds number is used to calculate the convective inertial boundary layer thickness that can form, and the Womersley number is used to calculate the transient inertial boundary thickness that can form.

  4. Reynolds stress - Wikipedia

    en.wikipedia.org/wiki/Reynolds_Stress

    In fluid dynamics, the Reynolds stress is the component of the total stress tensor in a fluid obtained from the averaging operation over the Navier–Stokes equations to account for turbulent fluctuations in fluid momentum.

  5. Reynolds number - Wikipedia

    en.wikipedia.org/wiki/Reynolds_number

    The Brezina equation. The Reynolds number can be defined for several different situations where a fluid is in relative motion to a surface. [n 1] These definitions generally include the fluid properties of density and viscosity, plus a velocity and a characteristic length or characteristic dimension (L in the above equation). This dimension is ...

  6. Reynolds stress equation model - Wikipedia

    en.wikipedia.org/wiki/Reynolds_stress_equation_model

    Reynolds Stress equation models rely on the Reynolds Stress Transport equation. The equation for the transport of kinematic Reynolds stress = ′ ′ = / is [3] = + + + Rate of change of + Transport of by convection = Transport of by diffusion + Rate of production of + Transport of due to turbulent pressure-strain interactions + Transport of due to rotation + Rate of dissipation of .

  7. Reynolds decomposition - Wikipedia

    en.wikipedia.org/wiki/Reynolds_decomposition

    Reynolds decomposition allows the simplification of the Navier–Stokes equations by substituting in the sum of the steady component and perturbations to the velocity profile and taking the mean value. The resulting equation contains a nonlinear term known as the Reynolds stresses which gives rise to turbulence.

  8. Turbulent Prandtl number - Wikipedia

    en.wikipedia.org/wiki/Turbulent_Prandtl_number

    The simplest model for Pr t is the Reynolds analogy, which yields a turbulent Prandtl number of 1. From experimental data, Pr t has an average value of 0.85, but ranges from 0.7 to 0.9 depending on the Prandtl number of the fluid in question.

  9. Reynolds-averaged Navier–Stokes equations - Wikipedia

    en.wikipedia.org/wiki/Reynolds-averaged_Navier...

    The Reynolds-averaged Navier–Stokes equations (RANS equations) are time-averaged [a] equations of motion for fluid flow. The idea behind the equations is Reynolds decomposition , whereby an instantaneous quantity is decomposed into its time-averaged and fluctuating quantities, an idea first proposed by Osborne Reynolds . [ 1 ]