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

When an object moves in the fluid, calculating "buoyancy" is correct? Does Archimedes' principle holds only when fluid is static?

G'day, I'm studying AN INTRODUCTION TO COMPUTATIONAL FLUID MECHANICS BY EXAMPLE and I'm confused about the way author calculated the total forces on a free falling sphere in the air (no wind). On...

07 April 2023 6,348 6 View

What is the relation between thrust coefficient curves and air density in wind turbines?

I came with the following explanation, but I am not sure if it is correct. The variation of the thrust coefficient is directly related to the variation of the thrust force. According to the...

05 December 2022 4,213 1 View

Why high voltage and current (and some gases) Cause Spray-mode metal transfer in Gas-Metal Arc Welding (GMAW)?

This transition phenomena of Globular to spray mode as voltage , and especially current is raised, is very commonly known to Manual Metal Arc Welding (MMAW) and Gas-Metal Arc Welding (GMAW)...

21 January 2021 8,154 2 View

How would I go about equilibrating the internal humidity of a closed system at 2 different temperatures?

I have a box which is kept at 4C which is enclosed in a ziploc bag. The dimensions of the box are: 18cm x 13.4cm x 4.9cm. The relative humidity of this internal environment is 30% at this...

08 January 2021 6,862 3 View

What are some concrete examples of time-fractional Navier-Stokes equations?

The introduction of time-fractional derivatives in the Navier-Stokes equations goes back to Lions and was recently extensively studied by many authors. When motivating such problems authors tend...

27 October 2020 9,757 4 View

How do you call a single nozzle bubble column reactor?

Hello, everyone! I am doing research on pool scrubbing and I am looking for experiments where a gas (preferably non-condensing) is injected into a pool by a single nozzle. I thought I could...

07 September 2020 7,324 3 View

How can i find the drag value created by the fluid in propeller motion system?

I am trying to calculate a needed torque value to rotate a basic propeller system. The reason that i am building this is to use as a simplified version of the real system. And i am stuck at the...

27 August 2020 2,905 5 View

Which fractional operator (with singular/nonsingular kernels, local, discrete, etc.) is more effective for modeling biological systems/processes?

To identify the most important fractional operator which is physically significant for the modeling of biological systems/processes (Viral dynamics, Fluid dynamics, Calcium dynamics and so on) to...

09 July 2020 8,266 3 View

Why does a turbulent flow form eddies?

I can't understand from a physical standpoint how fluctuating velocity components in a turbulent flow lead to formation of spinning structures of different sizes known as eddies. Can anyone...

20 June 2020 724 68 View

In solute dispersion through different flow geometry, what is the background of using the absorption rate or boundary reaction is of first-order?

Numerous previous studies have shown that the absorption rate $\beta$ is of first-order, but what is the reason? Smith, R., 1983, Effect of boundary absorption upon longitudinal dispersion in...

20 June 2020 5,380 0 View

How to transform a flow field to a rotating & translating frame of reference?

I have a velocity field v in an inertial frame of reference (it can be non-inertial too but not important). I want to analyze the same field observed by a rotating & translating observer. The...

23 May 2020 6,969 11 View

How to examine the stability of an airfoil?

In the problem of my interest, an airfoil is subjected to fluctuating flow forces associated with vortex shedding. The objective is to examine airfoil stability. In the literature, I saw drag and...

19 May 2020 5,451 1 View

Re-laminarize flow in open channels?

Is it possible to relaminarize flow in open channels by only changing the channel topology? Assume that the channel width is greater than 4 m (b>4 m), and also the discharge is greater than 5...

15 May 2020 3,402 0 View

Is there any research paper dedicated to accurate estimation of flow statistics near the wall of a circular pipe by Particle Image Velocimetry?

I am currently designing a set-up for PIV measurements of turbulent flow statistics in a circular pipe. Different approaches can be found in literature. In my view, the best way is the use of...

29 March 2020 9,803 3 View

What are the pros and cons of basing the simulation of an incompressible flow problem on the stream function-vorticity formulation?

I'm trying to develop a code to solve the stream function-vorticity equations using the Finite Element Method in order to simulate a 2D incompressible flow problem. I was wondering what the pros...

20 March 2020 4,224 6 View

Which CFD software to use for a rough simulation?

Hi I'm a beginner in CFD simulations. I have a complex geometry and I want to approximately visualize the airflow passing through this geometry. I don't need the simulation to be fully accurate,...

02 March 2020 3,455 20 View

How to construct differential equation of laminar flow inside a partially liquid filled long cylinder under action of gravity and uniform rotation?

The liquid flow is incompressible, steady state and effect of mass transfer and voltization of liquid can be neglected. I am trying to start from vector form of Navier-stokes equation \rho D/Dt...

30 December 2019 2,597 2 View

How to calculate impact velocity in fluid dynamics?

If the drop is coming out from a nozzle which hits the surface and spreads in all directions. So how can we calculate the impact velocity to go for dimensional analysis?

23 December 2019 9,531 2 View

Anyone looking for a research / PhD idea in aircraft aerodynamics?

Research idea: Use airflow analysis (CFD) to test the newtonian theory of lift on an airplane. Process: First, use CFD data and analysis tools to estimate the mass of air pushed down each...

16 November 2019 7,128 0 View

How to determine the technical oil in Ansys CFX ?

I had to calculate parameters of the technical oil flow in Ansys CFX. To solve this problem, I used "the Turpentine" (from Standard Ansys CFX material library) as the working body. Is it right ? I...

09 August 2019 7,975 5 View

? DOI number for book edited ? Oxford Press - Num. Meth. Fluid Dyn., II, Clarendon, ed. Morton & Baines, 463-475, 1986. ?

Dear Professor Baines, We need the DOI number for you book edited after the Reading Conference in 1985 : Conference on Numerical Methods for Fluid Dynamics, Reading, U.K., april 1985. J.M. VANEL,...

27 July 2019 3,769 2 View

Does the local Nusselt number increase with the vertical height (H) or decrease?

Hi Does the local Nusselt number increase with the vertical height (H) or decrease?

18 July 2019 3,152 4 View

Publication platform for open access and review: the document can be correct at any time instead of 1 or 2 blind review followed by journals?

Because of academic or research pressure, the number of papers and publishers are increasing. At the same time, the quality of the papers from even Q1 journals is also not up to the mark. A lot of...

28 June 2019 7,832 6 View

Can you recommend some points to me in fluid dynamics to start with in my graduate degree?

Just need some help

19 June 2019 2,558 15 View

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