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

What are the fundamental concepts of automobile aerodynamics in terms of CFD analysis that one should brush up?

An entry-level position has opened at a multi-national automobile company, for an Aerodynamics CFD Engineer. The job entails the following:• CAD cleanup• Simulation setup and processing (STAR-CCM+...

01 January 2016 1,768 0 View

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01 January 2016 7,182 1 View

Under which circumstances is it fundamentally true to simulate a two-component physical system by using a single-component (LBM) model?

I am using a single-component - two phase pseudo-potential LB model and need to compare my results. I, tried to compare my results with experimental data of falling of a water droplet into air...

01 January 2016 7,461 2 View

How to assign Neumann boundary conditions in finite elements?

I am developing a finite element fluid-dynamic code. I have doubts about the assignment of Neumann boundary conditions. As an example, free slip conditions along x axis requires: no penetrating...

01 January 2016 7,495 7 View

Is manning equation the best method to determine the discharges in open channels?

Is manning equations the best method to determine the discharges in open channels?

01 January 2016 2,253 26 View

How can I justify a drop in viscosity of alginate solutions by addition of monovalent salts such as sodium chloride?

I measured the viscosity of both pure alginate at 3% (w v-1) and a mixed solution of alginate at 3% (w v-1) +1% (w v-1) sodium chloride. Interestingly, instead of ending up with an enhancement in...

01 January 2016 8,436 3 View

How much rpm for spinning coat CORIN® XLS Polyimide resin(viscosity 9400) to 15um thickness?

I want to know what rpm to spin coat 15 um Polyimide thickness

01 January 2016 4,788 1 View

How the hydrodynamic mobility of an oblate ellipsoid is determined from the primary fundamental solution?

Using the singularity method, the primary fundamental solution (stokeslet) associated with a point force is obtained. The particle mobility for a spherical particle can be found after integrating...

12 December 2015 8,625 3 View

Can anybody explain the free body diagram for plug or slug type two-phase air-water horizontal pipe flow?

Hello everyone, I am recently working on experimental analysis of intermittent type two-phase air-water horizontal pipe flow. In this regards, i want to eagerly know the dynamics of intermittent...

12 December 2015 1,745 5 View

Which is the first paper for water hammer relationship (P=rho V C)?

Hello all, I have come across the following relation at many places reg. water hammer and acoustic in compressible flow i.e Pressure = density x fluid velocity x sound speed in fluid. I am...

12 December 2015 8,070 4 View

Which is the best numerical method to solve nonlinear PDE which arise in Fluid dynamics?

CFD

12 December 2015 1,155 4 View

How is the study of flow stabilty problem is important on the basis of Rayleigh's discriminant ? Especially in the case of pulsed flows ?

On the basis of Rayleigh's discriminant I have studied the stabilty if pulsed flow in Maxwell fluid. Results obtained in this framework represent a good agreement to the numerical one....

11 November 2015 9,340 0 View

Is it possible to identify optimum refrigerant distributor geometry by building a water-vapor mixture test set-up?

Hi Dear Colleagues, As you know, refrigerant two phase distribution at evaporator is big problem because of the fact that it can cause significant capacity reduction unless used optimum...

11 November 2015 8,537 1 View

How do I get Reynolds number, Froude number and Weber number from given Morton and Evotos numbers?

Dear all I am facing a problem related to non-dimensioning bubbble rising process in a quiescent medium. Almost all papers have described only two parameter ( Morton and Evotos number) which...

11 November 2015 3,890 9 View

How can I determine fluid velocity in Eulers cavitation formula for hydrodynamic cavitator?

I am wondering if velocity in formula means average velocity of fluid passing through cavitator, or velocity of fluid within the cavitator, between points with different pressure?

11 November 2015 7,627 2 View

Why surface tension depends on area of tested liquid?

I measure surface tension of water by Wilhelmy plate, capillary rise, and non-contact jet methods. When area of free liquid surface is less than approximately 0.04 m2 (20x20 cm = 400 cm2) the...

11 November 2015 8,928 16 View

Can the Marangoni effect be used to propel large-scale structures?

I saw a video in which the gradient in surface tension of two fluids caused a small boat to be propelled forward (Marangoni effect). Can that be used to move large-scale structures, like ships,...

11 November 2015 1,923 2 View

How to quantify mixing in microfluidics?

I have a microfluidic device having five outlet channels, and two inlets. I am flowing two nutrients through the 2 inlets (eg: say YPD(c1) and SD(c2)). The two nutrients are mixed in different...

11 November 2015 5,408 3 View

How can I obtain NU number in finned surfaces for forced convection B.C?

HI We have clear equation for free convection and finned surfaces. but how i can obtain NU an h in forced convection over a finned surface?

11 November 2015 4,131 2 View

Measuring stream flow/velocity remotely: do any cost-effective options exist (loggers, drones)?

I'm looking for advice on alternatives to measuring stream velocity and flow rates other than manual insertion of velocity meters. We are interested in tracking stream flows over time that our...

11 November 2015 2,864 7 View

What is the lower end limit on tubing diameter to successfully perform invasive blood pressure measurements in rats?

Our lab group currently uses a conscious, unrestrained but tethered 275-350g male Wistar rat model of sepsis. As part of this model invasive blood pressure measurements are taken continuously....

11 November 2015 8,770 6 View

What is the equation for primary/secondary wave speed in solids in 2D?

I found on Wikipedia that the equation for primary/secondary wave speed in solids in 3D is C_{solid,p} = sqrt((K+4/3*G)/rho) C_{solid,s} = sqrt(G/rho) where K is the bulk modulus, and G is the...

29 October 2015 2,978 2 View

Is it accuracy to simulate natural convection inside a duct without putting the duct in a large environment domain in Fluent?

Is it accuracy to simulate the transient performance of natural convection inside an air duct without putting the duct in a large environment domain in Ansys Fluent? The square duct is vertical...

10 October 2015 9,389 2 View

When water is drained through sink, free vortex is formed due to Coriolis effect. How can I model this phenomenon mathematically?

I am trying to find pressure and velocity distribution of irrotational vortices, and was able to find the equations at far from the vortex core, but I want to know what happens near the core where...

10 October 2015 1,734 12 View

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