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

Can gauge pressure in a closed tank and vapor pressure of the fluid be cancelled off in calculation of NPSHa?

If yes, is there any condition needed?

12 May 2017 5,533 3 View

How to determine geometric coordinate of a minimum length nozzle using Method of Characteristic?

I've done calculation to define the Characteristic lines as guided by J.D Anderson's book "Modern Compressible flow" but I can't find the plausible algoritm or method to determine the geometry....

11 May 2017 5,541 3 View

How can non-Newtonian (pseudoplastic) nature of liquid phase account for the decrease of void fraction in an upward co-current bubbly flow?

Maybe via the formation of larger bubbles which have higher rising velocity and result in the decrease of the respective residence time? If so, why shear-thinning behavior promotes the formation...

10 May 2017 6,114 9 View

Hello, can anyone help me for give a TLD standard ?

I need a TLD Standard.

07 May 2017 9,123 3 View

Does accuracy and rate of convergence of fpm is better over traditional mesh methods?

On behalf of accuracy and rate of convvergence, what is the significance in choosing mesh free methods [say finite pointset method] over traditional mesh methods for solving PDE for eg, two...

05 May 2017 514 3 View

How to Find the unknown populations at four corners in LBM?

Hi everybodyI am Trying to code a simple flow in a channel with LBM, and i got stuck in Boundary Corners. I am using Zou-He Boundary Condition ( Non-Equilibrium Bounce-Back or NEBB Method).I know...

04 May 2017 6,316 2 View

Is the flow rate of fluid the same at A and B?

Assume the flow rate of the fluid is 1 m3/hr at A and there is 10% spill back. with a total of 1.1 m3/hr flow rate of fluid across the pump.By referring to the image attached, can I say that the...

03 May 2017 4,054 4 View

Is the pressure used in the Bernoulli Principle is the pressure of the particular location?

When we want to apply the Bernoulli Principle, we cannot use the pressure of the fluid, but using the pressure at that particular location? If yes, how we measure or know the pressure at that...

03 May 2017 8,017 6 View

How to remove Lamb wave reflection from boundary?

Hello, Does anyone know a method for compensation/removal of ultrasonic lamb wave reflections from boundaries? I am looking for experimental techniques to remove reflection from the boundaries of...

03 May 2017 453 9 View

For the channel flow test case what is the value of the forcing term?

What value should I use for the viscosity and my in order to obtain the friction velocity? Thank you, Andrei

02 May 2017 3,936 2 View

Is it possible to use Heisler charts for the transient heat conduction problems for hollow cylinders?

Heisler charts for transient heat transfer problems are given for wall, long cylinders and sphere. I have a long hollow cylinder which is surrounded by argon gas on either side. I need to estimate...

24 April 2017 4,024 3 View

What's the kind of instability in the bubble pump of diffusion absorption machines?

In absorption diffusion absorption, flow in bubble pump generator oscillates under the effect of thermal supplied, gravity effect, fraction effect and acceleration effect. different kind of...

24 April 2017 8,446 4 View

Can anyone explain about such behavior of the plot?

This is contour plot of Mach number, obtained from flow over a flat plate at Mach number 3. Flow is viscous and laminar. Free Stream Conditions P = 101325 Pa Density = 1.225 kg per cubic...

22 April 2017 1,734 3 View

Under the same hypothesis, why Bernoulli's equations for incompressible and compressible flows give different results?

Assuming flow is:-Uncompressible-at constant H-irrotational-steady,why do the classical Bernoulli equation for uncompressible flows and the one for compressible flows give different results for...

19 April 2017 6,578 6 View

PSI-C method for one way coupling in fluent

Hi Everyone, For simulating particle distribution inside an office room I am using DPM model in ansys fluent. But DPM will only give particle trajectories not mass concentration. I learned that...

12 April 2017 4,936 1 View

What are different correlations between nusselt number and reynolds number for laminar flow?

Please tell me different correlations between nusselt number and reynolds number for laminar flow. Various papers have correlations for turbulent flow. I want it for laminar flow. Kindly help me.

11 April 2017 7,691 3 View

DPM and MHD?

Hi, I'm trying to simulate the trajectories of magnetic particles in fluid channel with external magnetic field applied, using discrete phase modelling (DPM) with magnetohydrodynamic (MHD) addon...

10 April 2017 2,935 1 View

What are the nature of active forces in an oil reservoir?

In Classical fluid mechanics, according to Navier-Stokes equation, the main forces acting on a flowing continuum include convection, molecular transport, and external forces. In the case of fluid...

07 April 2017 1,893 3 View

I am working on aircraft design where non metal hose is experiencing negative fluid pressure of -5 psig. how to check whether my hose is safe or not?

generally for positive pressure we do calculate hoop stresses. in this case inside fluid pressure is negative while outside is atmospheric. this negative pressure actually collapse tube/hose. so...

06 April 2017 4,307 1 View

On the observation of Devil's Staircases, coexistence of chaos and quasiperiodicity, and period quadrupling in Navier-Stokes equations?

Dear All, I am working on understanding the transition from laminar to turbulent behaviour in Navier-Stokes equations by the approach of dynamical systems theory. I have derived a...

04 April 2017 8,087 6 View

External magnetic field data for MHD in Fluent?

Hi, I'm trying to use Magnetostatic module in Ansys to generate magnetic field data and use MHD addon module in Fluent to observe magnetic particle (DPM) interaction with the magnetic field in...

04 April 2017 1,068 1 View

How do I make 'Transport of Diluted Species a function of level set function(phi) in Comsol?

I am modeling a two phase multiphysics system in comsol multiphysics. My system have total of three physics, 'Two Phase Laminar flow(level set)','Heat Transfer' and 'Transport of diluted...

03 April 2017 675 1 View

How to distinguish small scale turbulence resistivity from large scale turbulence resistivity?

Hello, I need calculate the contribution of small scale turbulence resistivity to the magnetic dissipation in the non-ideal turbulence MR diffusion zone. Even there are some explain on mean field...

28 March 2017 1,777 2 View

How to make viscosity measurements of a slurry by monitoring the drag of a slender body ?

I want to make continuous viscosity monitoring of a ceramic slurry by measuring the drag of a slender body immersed in it. The body is slender, axisymmetric in shape, and immersed in a ceramic...

27 March 2017 5,396 12 View

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