Fluid Dynamics

Fluid dynamics is a sub-discipline of fluid mechanics that deals with fluid flow—the natural science of fluids (liquids and gases) in motion. | Contact experts in Fluid Dynamics to get answers

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Questions related to Fluid Dynamics

Which turbulence model is the most preferred for modelling Laminar-Turbulent transition on leeward side in Hypersonic Afterbody flows?

Typically in Hypersonic Re-entry flows of Blunt Body objects and at an angle of attack which leads to the laminar-turbulent transition in the boundary layer on the leeward side(caused by...

22 July 2017 5,876 4 View

Can I sample either in the middle or from the side of the vessel?

Our equipment enables sampling through the paddle shaft, in the middle of the vessel, or through a cannula 1 cm from the vessel wall. Considering the hydrodynamics, would it be better to sample...

17 July 2017 8,084 3 View

Is there any way to use Brownian motion to cause unidirectional motion?

I would like to know if there is any work available which uses Brownian motion to lead to unidirectional movement (Ex. Unidirectional motor). Brownian motion is extremely random. Can we utilise it...

07 July 2017 8,238 2 View

How to do CFD analysis of human blood flow

Computed fluid dynamics of human blood by considering blood pressure

06 July 2017 6,767 5 View

The Nomoto's models, do his constants depends of lenght a velocity?

The second order of Nomoto's models depends of 4 constants (k, T1, T2 and T3) and I would know an equations where those constants depends of lenght and velocity

06 July 2017 7,459 6 View

What are those constants in Nomoto's models for ships? How can I get the values of those constants?

I have read some papers and I know that T1, T2 y T3 are time constants and K is a gain. Also, it depends of some coefficients inertia coefficient (m1,m2,n), resistance coefficient (Cl,Ck,Cm and...

06 July 2017 1,703 2 View

I am trying to solve the pde shown below. Any help is most welcome.

a is a function of x, y, z, t; w is a function of x, y, t and f is a function of x, y, z, t. x, y, z are spatial coordinates and t is time. Thanks

30 June 2017 5,029 4 View

How to quantify the energy into and parallel to a plate in Comsol?

I'm working on a problem involving a fluid impact on the forehead. I understand some waves ( Lamb or Rayleigh) will be generated due to the impact force. I'd like to simulate the event in Comsol...

27 June 2017 7,340 1 View

Does the different fluid rheology models affect the von-Mises stress in the structural domain ?

In the carotid artery different fluid models-Newtonian and Non-Newtonian models are applied to observe the various fluid parameters . Does changing these models affect the von-Mises criterion used...

22 June 2017 6,081 1 View

What is the significance of Mach number, pressure and velocity variation profiles?

What is the significance of mach number, pressure and velocity variation profiles? I read a lot of papers on spray modeling using different software packages like Kiva, Star CD etc. what's the...

20 June 2017 3,247 3 View

Hi everyone

I have calculated the normal force coefficients by integral the pressure coefficients along the airfoil chord. But I do not know how I calculate the tangential force coefficient by integral the...

16 June 2017 379 2 View

Sound Energy Loss in pipe and orifice

IN THE NAME OF GOD I want to calculate Energy loss in pipe or orifice when I know the sound level at a defined distance from it. for example we consider a 20" methane pipe that an orifice plate...

11 June 2017 1,937 2 View

What is the bottom limit for Stoke's Drag assumption in terms of particle size?

Hello everyone, I was trying to model concentration gradients in a flow-free diffusion chamber using COMSOL. I wanted see what would be the effect of gravity on the concentration gradients that I...

07 June 2017 2,870 3 View

Relation between viscous shear stress and shear strain rate for an in compressible fluid like water

Few books are writing (2*coeff of viscosity mu) others are writing (coeff of viscosity mu) Which one?

06 June 2017 4,566 2 View

Relationship between shear strain rate and velocity gradient for an in-compressible flow.

These two equations can be found which varies from book to book.

06 June 2017 6,263 1 View

Defining the entropy of turbulence in terms of the Reynolds number?

Hi, Let us consider a large ensemble of vortices immersed in a flow domain. The Helmholtz free energy is given by F=E-Tk F=E-Tk ln N, where k is the Boltzman constant, and W is the number of the...

01 June 2017 1,189 4 View

Can I use the lattice Boltzmann method to simulate the supercritical fluid (SCF) flow in nanoporous? Which model should I use?

A supercritical fluid (SCF) is any substance at a temperature and pressure above its critical point, where distinct liquid and gas phases do not exist. It can effuse through solids like a gas, and...

30 May 2017 3,444 3 View

Why is it common to treat multiphase flow as incompressible?

Hi, It is known that the speed of sound in the mixture region between two phases is lower than the speed of sound of each phase. Therefore, is it still justified to use incompressible formulation...

23 May 2017 5,966 6 View

How can i solve an evolution problem for non-linear flow in Ansys Polyflow?

Hi everybody, In generalized newtonian flow, i choose the power law and arrhenius law model for shear rate and temperature dependence of viscosity. The value of power law index is 0.45, so i must...

23 May 2017 3,807 2 View

How to do you solve the navier stokes equations in 3d using matlab ?

what is the best way to solve the non linear term in the navier stokes equations

23 May 2017 9,089 9 View

How's the diffusivity equation written and solved in two-phase gas/liquid flow?

the diffusivity equation describes pressure profile during flow of fluids through porous media. this equation is normally written for single phase flow, i.e. either oil or gas flow. However, there...

17 May 2017 9,452 3 View

I am working on CFD analysis for naturally ventilated hospital wards, i have a question regarding the vector plot:

1- how can i differentiate between a vortex and re-circulation flow? 2- what is the effect of a recirculation zone inside a space, i mean does it enhance ventilation or the opposite? 3- does a...

15 May 2017 8,329 3 View

Natural convection in cavity?

Hi can any one send me article about numerical or experimental simulation for steady or unsteady flow inside.

13 May 2017 2,597 2 View

How can I make sure there is no back flow in the system?

Kindly find the image attached. Pressures of the fluid in A, B, C, D and E are difference.If certain pressure is too low, how can I prevent the back flow from occurring? By arranging the pipe of...

12 May 2017 1,840 3 View

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