When was the arrow symbol for a vector first used?

Arrow symbol for a vector . My question concern the use of an arrow to represent a vector. For a spatial vector, it shows the direction, and this is also the case for the vector representation of...

06 July 2018 4,995 1 View

How come that the 1/r potential is so exploited, e.g. in electromagnetism when there is no source?

05 June 2017 6,819 14 View

Navier-Stokes in nondimensional variables. ?

05 June 2017 9,519 0 View

Stationary waves?

What is the recent 'definition' of dualism? Does it concern a particle and its interaction, or more a particle in a traveling wave motion? Can it be described with a density, or will that be a...

05 June 2017 5,979 32 View

Interactions between scales for solutions?

Are there any general statements to refer to, concerning this? For example so-called acoustic pressure occurs both in the water and in structures in the water, so that is one case. Other...

05 June 2017 3,754 5 View

How is an entropy wave derived from Navier-Stokes?

There is an entropy inequality in fluid mechanics, and from bounds to that, a first order wave (convective wave) is given. With assumptions of ideal gas, internal energy proportional to...

05 June 2017 6,334 9 View

Models for light?

What models are there for light in a plasma and in a lightning at thunder? Maxwell's equations is not so easy to invoke in continuum mechanics.

05 June 2017 7,827 11 View

Studies of wavelets with dimension?

Are there any famous and easy to read, or benchmark study on wavelets, where they use dimensions for time and frequency? If the amplitudes have a correlation to spatial coordinates, for any...

04 May 2017 3,772 2 View

When is the onedimensional energy equation applicable?

I looked at energy conservation in e.g. a pipe, assuming internal energy proportional to temperature. Then with the ideal gas law, the static solution is a mode shape, with wavelength depending on...

04 May 2017 8,361 2 View

HV Transmission pole (possible scaling and function?)

01 February 2017 8,402 3 View

Why are the velocities so high in my Boussinesq approximation Fluent simulation?

Hello, I have a mechanism where air rises due to convective flows. In this simulation, nothing is driving the air except this. I understand that the Boussinesq approximation only works for small...

02 March 2021 4,910 3 View

What is the characteristic length to determine the Reynolds number for the scattered turbulent fluid flow?

Dear all, I just saw this example in FB on the difference between laminar flow and turbulent flow. The flow from a pipe hits the sink and scattered. The flow from the pipe is characterized as...

02 March 2021 1,999 5 View

Is there a deep reason for using the squared modulus of the wave function as the probability density of the existence of the particle?

I think we were all surprised at the first time we got to know quantum mechanics that the squared modulus of the wave function is the probability density of the existence of the particle? The role...

28 February 2021 6,282 9 View

How do you mesh a thin solid in Fluent?

Hello, I have used the shell function on SpaceClaim to create thin solids for the model I am studying. These are contained within an enclosure for my study. I chose this approach as it avoids the...

24 February 2021 8,856 3 View

No streamlines present in a small region inside a flow. This means exactly what?

No streamlines present means whether the flow is getting obstructed there and the velocity inside the region is zero? Or else, the fluid is trapped inside that region with a nonzero velocity?...

22 February 2021 5,249 10 View

The most suitable method to calculate the stress intensity factor in the presence of contact between the crack lips?

I'm trying to study cracked structures under a compressive load taking into account contact between the crack lips. I would like to know if the method of extrapolation by displacement remains...

21 February 2021 8,694 4 View

Can anyone help with an Accurate Diffuser Expansion Loss formula for rectangular shaped diffusers in turbulent flow regime?

I have tried Idelchik's Handbook of Hydraulic Resistance 4th Edition (2007 page 300) formulas and across some range the formulas are reported valid for, the law of conservation of energy is...

20 February 2021 2,504 1 View

How to visualize stress in a coating defined by "Skin" in Abaqus?

Hello All! I'm trying to model a contact between a coated substrate and a tip in Abaqus. The coating is ultra-thin compared to the geometry of the substrate. So I defined the coating using the...

16 February 2021 1,594 3 View

How can I find the thermophysical properties of high temperature microencapsulated phase change materials (MPCM)?

Hi everyone. I am looking for a high temperature MPCM. More specifically, I need the thermo physical properties of a microencapsulated phase change material with the melting temperature between...

14 February 2021 3,606 2 View

How complex systems physics/statistical mechanics would be helpful for particle physics & Networking?

Recently, I've been selected for an ICTP program named Physics of Complex Systems. But, I have a keen interest in Particle Physics & Quantum networks. As statistical mechanics involved in...

11 February 2021 699 3 View