In general, the material derivative describes the time rate of change of a physical quantity, such as heat or momentum, for a material element subjected to a space- and time-dependent velocity field.

- Q. What is the derivative of flow?
- Q. What is meant by material derivative?
- Q. What is substantial time derivative?
- Q. What does spatial derivatives mean?
- Q. What is material acceleration?
- Q. Can a steady flow have acceleration?
- Q. What is the difference between local and convective acceleration?
- Q. What is Navier-Stokes equation of motion?
- Q. Who has solved the Navier-Stokes equation?
- Q. Does Navier-Stokes assume laminar flow?
- Q. What are the non linear terms in the Navier-Stokes equation?
- Q. How are Navier-Stokes equations used in CFD?
- Q. What equations do CFD use?
- Q. What are different the terms used in Navier Stokes equations?
- Q. Is Bernoulli equation derived from Navier Stokes?
- Q. Can you reduce Euler’s equation to Navier Stokes equation?
- Q. What is Euler’s equation used for?
- Q. What are the assumptions and limitations of Euler’s formula?

## Q. What is the derivative of flow?

What Is a Flow Derivative? A flow derivative is a securitized product that aims to provide maximum leverage to profit from small movements in the market value of the underlying. Flow derivatives are typically based on the value of currencies, indexes, commodities, and in some cases individual stocks.

## Q. What is meant by material derivative?

From Wikipedia, the free encyclopedia. In continuum mechanics, the material derivative describes the time rate of change of some physical quantity (like heat or momentum) of a material element that is subjected to a space-and-time-dependent macroscopic velocity field.

## Q. What is substantial time derivative?

Substantial derivative is an important concept in fluid mechanics which describes the change of fluid elements by physical properties such as temperature, density, and velocity components of flowing fluid along its trajectory [61].

## Q. What does spatial derivatives mean?

A spatial gradient is a gradient whose components are spatial derivatives, i.e., rate of change of a given scalar physical quantity with respect to the position coordinates. When evaluated over vertical position (altitude or depth), it is called vertical gradient. Examples: Biology.

## Q. What is material acceleration?

The material acceleration is defined as the acceleration following a fluid particle. The term on the left is the total acceleration following a fluid particle. It represents the actual acceleration vector experienced by whatever fluid particle happens to reside at the location and time of interest.

## Q. Can a steady flow have acceleration?

In a steady flow, the temporal acceleration is zero, since the velocity at any point is invariant with time….

Type of Flow | Material Acceleration | |
---|---|---|

1. Steady Uniform flow | 0 | 0 |

2. Steady non-uniform flow | 0 | exists |

3. Unsteady Uniform flow | exists | 0 |

## Q. What is the difference between local and convective acceleration?

Local acceleration results when the flow is unsteady. because it is associated with spatial gradients of velocity in the flow field. Convective acceleration results when the flow is non-uniform, that is, if the velocity changes along a streamline.

## Q. What is Navier-Stokes equation of motion?

It is generally expressed as Fr = v/(gd)1/2, in which d is depth of flow, g is the gravitational acceleration (equal to the specific weight of the water divided by its density, in fluid mechanics), v is the celerity of a small surface (or gravity) wave, and Fr is the Froude number.

## Q. Who has solved the Navier-Stokes equation?

Russian mathematician Grigori Perelman was awarded the Prize on March 18 last year for solving one of the problems, the Poincaré conjecture – as yet the only problem that’s been solved. Famously, he turned down the $1,000,000 Millennium Prize.

## Q. Does Navier-Stokes assume laminar flow?

The simple form of the Navier-Stokes equations only encompasses the change in properties such as velocity, pressure, and density under dynamic conditions for one phase laminar flow.

## Q. What are the non linear terms in the Navier-Stokes equation?

1.2. The nonlinear term in Navier–Stokes equations of Equation (1.17) is the convection term, and most of the numerical difficulties and stability issues for fluid flow are caused by this term.

## Q. How are Navier-Stokes equations used in CFD?

Navier-Stokes equations are the governing equations of Computational Fluid Dynamics. It is based on the conservation law of physical properties of fluid. The principle of conservational law is the change of properties, for example mass, energy, and momentum, in an object is decided by the input and output.

## Q. What equations do CFD use?

The fundamental basis of almost all CFD problems is the Navier–Stokes equations, which define many single-phase (gas or liquid, but not both) fluid flows. These equations can be simplified by removing terms describing viscous actions to yield the Euler equations.

## Q. What are different the terms used in Navier Stokes equations?

where u is the fluid velocity, p is the fluid pressure, ρ is the fluid density, and μ is the fluid dynamic viscosity. The different terms correspond to the inertial forces (1), pressure forces (2), viscous forces (3), and the external forces applied to the fluid (4).

## Q. Is Bernoulli equation derived from Navier Stokes?

Navier stokes equation is a simplified form of “Newton’s law” equation of motion. Which includes the forces due to viscosity of the fluid. Whereas, Bernoulli’s equation is derived from Equler’s equation where force due to viscosity is neglected. This is a dominant difference!

## Q. Can you reduce Euler’s equation to Navier Stokes equation?

Computational Fluid Dynamics (CFD) is most often used to solve the Navier-Stokes equations. Euler’s equations can be simplified further to obtain Bernoulli’s equation, which is applicable to steady, incompressible, inviscid flow along a streamline.

## Q. What is Euler’s equation used for?

Euler’s formula relates the complex exponential to the cosine and sine functions. This formula is the most important tool in AC analysis. It is why electrical engineers need to understand complex numbers.

## Q. What are the assumptions and limitations of Euler’s formula?

Limitation of Euler’s Formula There is always crookedness in the column and the load may not be exactly axial. This formula does not take into account the axial stress and the buckling load is given by this formula may be much more than the actual buckling load.

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