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

How can I calculate friction factor in hydrodynamically developing flow?

As it is known if pressure drop between inlet and outlet of a geometry is known friction factor can be calculated from equation below; Dp = f (L\D) (ro U2\2) But use of this equation is only...

21 March 2017 1,066 3 View

Contact Problem between beam elements and fluid particle (using SPH method) ??

Hello Everyone,I am having problem running abaqus simulation to simulate 5 filaments, that are being fixed at one side and free at the other side. Water is gonna flown across these filaments, as...

21 March 2017 8,806 3 View

How to use rotameter to calculate the pulsed air injection in to the fludidized bed?

Hi everyone, I am using multi tube flow meter panel to measure the compressed air pulse sent to the fluid bed at certain pressure. The bed pressure is varied from atmospheric pressure to 30 mbar....

21 March 2017 9,041 2 View

ANSYS FSI Problem - Gel Particle Transport Through Porous Media

Please read the following PDF file which contains a fair description of my problem: https://www.dropbox.com/s/q2wk81yxfuvrwws/Problem%20Definition.pdf?dl=0 Also, you can find my ANSYS files...

20 March 2017 7,426 3 View

Is that possible to apply a constant temperature boundary condition using electrical current?

there is some materials which called self-regulating or self-controlling temperature materials and used in heating elements (some ceramics which called PTC). is that possible use these materials...

19 March 2017 3,456 3 View

Urgent: oil/water displacement, problem of solver-PDEs-Failed to find solution in COMSOL

Hi everyone Help me please, I am at the end of the abyss. I work on: influence of the addition of surfactant on the displacement of the oil by the water-view of wettability changind and interface...

18 March 2017 3,497 3 View

How flow separation takes place between laminar to turbulent. What are factors which effects the separation processes?

how flow separation takes place between laminar to turbulent. What are factors which effects the separation processes.

18 March 2017 5,061 8 View

Where does the low frequency come from when measuring the boundary layer with hot-wire ?

I have met a problem in measuring boundary layer by using hot-wire and sincerely ask for advice: There always exist low frequency disturbacnes ( around 10hz~20hz) when the probe intrude into the...

17 March 2017 8,457 8 View

Using comsol how to simulate a device with movable free part in it?

Say a rectangular box with movable cylindrical roller inside simulated in comsol with a force applied in Z-direction. How to see the movement of inner cylindrical roller in both x and z direction?...

15 March 2017 3,487 0 View

How cMUT is able to generate ultrasonic waves in air?

I understand, peizo transducers can't generate ultrasonic waves in air due to 1) large acoustic impedance mismatch between PZT (~106 Rayl) and air (400 Rayl) and 2) attenuation of sound waves in...

13 March 2017 1,164 7 View

Difference between single and multi point turbulence closure models?

Please suggest any books or materials for reference.

11 March 2017 3,073 3 View

What type of contacts do we need to use for interface between fluids and solid ?

What type of contacts do we need to use for interface between fluids and solid ? (For Fluent)

10 March 2017 4,420 3 View

Nusselt Number corelation for hot liquid flow through inner annulus of pipe in case of Laminar flow.

I encountered a problem in my project work on heat exchangers where to find heat transfer coefficients on the defined conditions the Reynolds number came to be 1753.8 while the Prandtl number is...

09 March 2017 4,841 3 View

What should be the reference area for calculating drag and lift coefficients in case of elliptic cylinder?

Hi, I'm studying the turbulent flow past an elliptic cylinder at different angle of attacks. What reference area should be given to FLUENT for lift and drag coefficients? Should it be varying with...

06 March 2017 9,914 8 View

Why "Mass Integral" calculates differently compared to "Mass"?

In a droplet impact onto a stationary particle, I want to calculate mass conservation of VOF method (before impact vs. after impact ends). For that, I use Reports => Volume Integrals window. In...

03 March 2017 8,389 6 View

Center of rotation of Pitching and Heaving airfoil?

Hello I am trying to investigate flow around pitching & heaving airfoil in Fluent. I am using DEFINE_CG_Motion function. If I run on of each motion solitary, they work correctly. But when I...

25 February 2017 1,587 1 View

Particle tracing simulation in COMSOL,inertial fluid

I want to simulate a particle tracing system in COMSOL.the flow regime in the device is laminar. two forces affect the particles. A drag force which obey the stokes law, the other is inertial lift...

25 February 2017 7,240 2 View

Conversion of power model to carreau model

I`m studying free convection of non-newtonian fluid inside cylindrical geometry using comsol multiphysics. The fluid can be represented by power law with power law index 0.5. The disadvantage of...

18 February 2017 6,654 4 View

How the flow rate of pump is controlled for constant impeller speed?

If although regulating flow valve is used does flow rate remains constant since as per continuity equation A1V1=A2V2 for incompressible fluid?

19 January 2017 3,445 4 View

How to calculate drag and lift force from pressure coefficient?

I want to use to calculate drag and lift force from pressure coefficient of a sphere.

12 December 2016 8,544 7 View

Does anyone know how to calculate camber on glulam?

Well, I feel so confused about calculate camber on glulam. Is it determined by radius or span or else? Does anyone here have some formula to calculate it? Thank you anyway.

10 October 2016 1,633 2 View

Index variation at bifurcation points?

Dear all, I am planning to investigate laminar-turbulent phase transition in fluid dynamics via studying the bifurcation characteristics of the Navier-Stokes equation. I would like to know if...

10 October 2016 2,861 2 View

Why the step circled in the picture found in almost seaplanes ? does this step cause aerodynamic difficiency after take-off?

i want to know the reason why all flying boats and amphibious planes share this step in the hull, whether they have any side effects on aerodynamic performance.

10 October 2016 246 6 View

How to implement a higher order FD scheme, like 5th or 7th order WENO or 6th order central scheme near boundaries?

How do you implement a higher order finite difference schemes, like 5th or 7th order scheme, or a 6th order central scheme near boundaries? As in, near boundaries you don't have enough points to...

10 October 2016 1,930 3 View

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