Ahmed Abdelhameed

11 Questions 101 Answers 0 Followers

Questions related from Ahmed Abdelhameed

Is it possible to use meshless(mesh free) instead of mesh technique to sort out most of flow problems?

Using mesh free may be reasonable to overcome most of flow problems compared with using mesh method. However, cost of CPU time , stability and accuracy will be concerned.

21 March 2019 6,438 0 View

Is it possible to use meshless method to use DNS without turbulence models?

Grid generation is the heart of numerical solution.Adaptive grid will help to use DNS to overcome most of turbulent flow problems without using turbulence models ,however to construct or design...

06 March 2019 6,938 10 View

What Flow Regimes Cannot Be Solved by the Navier-Stokes Equations?

The Navier-Stokes equations are only valid as long as the representative physical length scale of the system is much larger than the mean free path of the molecules that make up the fluid. In that...

02 March 2019 9,089 31 View

Is it possible to construct or design a mesh(grid) to be used in DNS for turbulent flows instead of using turbulence models?

Grid generation is the heart of numerical solution.Based on DNS which came from well known theory it is considered to suit all the flow applications (laminar and turbulent). The problem is how to...

09 February 2019 7,919 3 View

Why are we late to use tap water in washing clothes instead of using detergants?

All the detergents are not responsible for washing clothes but all they do is to make the tap water do it by changing the surface tension of it. If we can reformulate(not separate) the molecular...

31 January 2019 7,163 3 View

How do we control the ice thickness forming on the wing of air craft to prevent flow separation?

The adverse effects of ice formation on the aerodynamic characteristics of wings and helicopter blades are well known. It is known that icing may cause premature flow separation and lead to stall...

28 January 2019 6,302 5 View

Why do not we use flying turbines instead of fixed turbines ?

There are some places which face some difficulties in using fixed wind turbines in particular, developing countries. It is realistic to use flying turbines especially the out put power could reach...

06 January 2019 5,116 9 View

How do we design a floating bridge on sea or river using jet water?

Using jet water to carry floating bridge on river or sea carrying people ,cars and others between two towns.

31 December 2018 9,767 3 View

Is it realistic to choose blade loading of gas turbine more than unity?

The choice of blade loading of gas turbine is related with the efficiency of gas turbine, pressure gradient diffusion losses and friction losses. It is not realistic to have blade loading of gas...

20 December 2018 976 1 View

Is it reliable to develop NSE(DNS) to cover all the practical problems and far away of turbulence models?

Navier - Stokes Equation is remarkable equation since 1845 and still cover most of the practical problems even in case of turbulent flow regimes.But in cases where the effect of turbulence is...

05 December 2018 2,194 6 View

Is it possible to use One trbulence model in fluid dynamics for all the practical applications ? if not, why?

There are many different turbulence models to be used in fluid dynamics applications. The question is why do we need to use different turbulence models for each application? is it possible to...

28 November 2018 5,404 24 View