Why the weight function in weak form is considered to be zero?

Dear All, I was wondering, why in FE formulation, and in the case that both Dirichlet and Neumann BCS are imposed, the weight function (W or v) on the boundary is considered to be zero? Would...

02 March 2019 9,520 6 View

How to create multilayer mesh in NetGen?

Hello all, I need to create a multilayer mesh for light propagation modeling. I use NetGn. In NetGen I create each layer separately and then merge them together. But when I run simulation it seems...

09 October 2015 2,417 0 View

What are the principles of stereoscopic designs?

06 July 2015 2,605 0 View

Could COMSOL be used for diffuse reflectance spectroscopy modeling?

Does COMSOL have the same capabilities as the monte carlo method in modeling light-tissue interactions in terms of calculating and obtaining light distribution over the surface as well as inside...

02 March 2015 5,713 3 View

What are the angular and spatial distribution (intensity) of remitted light? Can Monte Carlo method compute them both?

I need to understand what is the difference between these two parameters. Also need to know if Monte Carlo method is able to compute them ? If not what other algorithms could...

01 February 2015 7,636 3 View

What is diffuse reflector and what would be spectrally flat diffuse reflector?

01 February 2015 3,591 3 View

How can I simulate the Darcy problem (flow movement) in porous medium under large deformation?

I would like to simulate the Darcy problem in a porous medium undergoing large deformations, but I'm not sure what commercial packages would be able to do that. Do you have any guidance or insight...

01 February 2015 6,085 10 View

Which one is suggested for multiphysics modeling?

31 December 2014 2,331 3 View

Physics: Why do we describe light by referring to its wavelength, but microwaves and radar pulses by referring to their frequency?

In physics, the description of the properties of light generally refers to its wavelength (nm), while in the range of microwaves and radio waves we refer to the frequency of a signal (e.g. kHz or...

03 March 2021 1,682 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

Is there any effect of different colours of light (white, red, yellow, blue etc.) on the rate of photosynthesis? If yes, why?

Light is inevitable for the process of photosynthesis reaction. Naturally sunlight plays the vital role for this process. Light may be of different colours like white, red, yellow, blue etc....

02 March 2021 7,890 2 View

Why almost every element would be metallized in sufficiently high pressure and low temperature?

(This statement is from wikipedia, BTW). What is so special about metallic bond that is limiting high-P low-T state of a matter (as long as individual atoms exist, not white dwarf of neutron star...

02 March 2021 3,309 2 View

What is the density for pva electrospining?

I'm Juan Carlos, a high school student who is working with electropinning, I made an electropinning machine with a 21g needle and a 30kv high voltage source and the distance between my needle is...

28 February 2021 298 3 View

How to Eliminate cosine error and abbe error in LASER measurement system(for example Rhenishaw XL80)?

I like to do project in laser measurement system. My objective is to eliminate or reduce the cosine error, abbe error in Laser measurement system. I have Rhenishaw XL80 system. Please tell the...

28 February 2021 4,890 3 View

What is Flat Lens Antenna?

28 February 2021 5,433 3 View

In an eye with Tyndall, does each dot correspond to an individual cell?

When you observe the presence of Tyndall in an inflamed eye: Does each of the small floating dots correspond to an individual cell or to an aggregate of cells? Does a conventional slit lamp have...

27 February 2021 6,326 2 View

Can impedance of antenna be less than 50 ohms?

I am simulating helix antenna in hfss, right now, giving excitation with 50 ohms port. When I see the results of Z parameter (real). It shows lower than 50 ohms. Do not understand, if it can be...

27 February 2021 4,218 7 View

Should we reduce the standard unit of length to 0.31951540592 meter ?

The reasoning behind this question is to align the ratios of the proton potential in energy per charge to the speed of light in distance per time. As these two dimensions appear to be related,...

27 February 2021 947 7 View