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 is the status of promotion& educational content acceptance of student comments on learning process?

Comments of people on B position in discourse(students) , i.e not the As who are trying to domunate the line of thinking (teachers) are improper. But what if they refer to the learning process,...

04 May 2024 8,960 0 View

How can generative AI be used in virtual reality and gaming?

16 January 2024 805 2 View

How does energy flow in and out of Earth's atmosphere and difference between the cycling of matter and the flow of energy through the spheres?

11 January 2024 4,834 2 View

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 6,371 6 View

When should I use "intermittency transition" (gamma transport equation) in ANSYS?

I've worked on simulating 3D VIV (a cylinder forced by Karman vortex street) and been stuck with settings. Considering the transition to turbulence due to the oscillation of cylinder (Re≤200,...

05 April 2023 2,868 3 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 4,235 1 View

Why is SST model unable to predict reattachment length correctly?

Hello all, I've got a 2D simulation case in which the flow separates from the sharp leading edge of rectangular bluff body and reattaches to the wall some distance downstream. The main goal is a...

17 November 2022 9,149 4 View

How to tackle with plasticity/creep/connector friction algorithm didn't converge at 'x' point in Abaqus using CDP model?

Hello everyone, Does anyone have any idea on how to deal with such warning messages in Abaqus where the CDP model is being used? My model consists of concrete(C3D8R element) and steel bar...

02 April 2021 8,954 0 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 8,182 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 6,889 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 9,783 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 7,352 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 2,926 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 8,297 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 764 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 5,398 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 6,988 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 5,487 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 3,418 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 9,822 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 4,251 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 3,487 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 2,615 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 9,550 2 View

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