Does Reason joust with Nature?

Sometimes human beings anthropomorphize Nature. What did Nature have in mind? Or, how did Nature arrange that? Or, what trick does Nature have up her sleeve? As if Nature were animated by a vast...

07 August 2018 5,044 2 View

What are the best scientific dialogues?

Galileo wrote Two New Sciences (Discorsi e Dimostrazioni Matematiche Intorno a Due Nuove Scienze in Italian). It is presented as a three way discussion, among Salviati, Sagredo, and Simplicio....

07 August 2018 4,081 6 View

Is the principle of similar systems redundant to dimensional analysis?

Physically Similar Systems: A History of the Concept is a chapter in the Springer Handbook of Model-Based Science by S. G. Sterrett. It is an interesting history. The principle behind similar...

07 August 2018 7,837 1 View

Should dialogue ever be used to present scientific ideas?

Typically in text books on a subject the presentation is by way of exposition. The reader in effect has an experience analogous to that of a person reading a story. There is the writer...

07 August 2018 4,534 6 View

Does the concept of degrees of freedom play a role in computer circuit design?

This is a follow up question to a question I recently posted, How much faster at calculation are n networked identical computers compared to one? I don't know anything about computer circuit...

05 June 2018 5,302 1 View

Does physics resist new ideas?

Analogize physics to language. Language and its lexicon are ways of encoding ideas about phenomena, concepts and their relationships to each other. Physics is a way of encoding ideas about...

05 June 2018 8,337 0 View

How much faster at calculation are n networked identical computers compared to one?

If networked people are faster solving problems than one, does the same apply to computers? Are there necessary constraints for this problem? Is there any benefit to knowing the answer to this...

04 May 2018 3,482 5 View

What is energy?

03 April 2018 6,316 34 View

Which is harder, finding a good problem or finding its answer?

The great mathematician David Hilbert set out twenty-three important problems in mathematics in 1900. One of the famous outstanding ones is the Riemann zeta hypothesis. One might argue that once a...

03 April 2018 4,529 8 View

Is intelligence an inherently unstable feature of an advanced society?

Collective intelligence enables the accumulation of knowledge, culture, science and technology and, in stable political physical and economic environments, improves economic well-being. So is...

01 February 2018 9,452 4 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

Can we distinguish the type of free fluid inside the pelvic and abdominal cavities whether blood or serous fluid using the ultrasound?

during ultrasound examination of acute abdomen, sometimes we see free fluid , can we know the type of fluid ,whether blood or not , using ultrasound only? if yes , what are the sonographic...

01 March 2021 7,476 4 View

How much pressure we can reduce at the outlet to avoid Reverse Flow?

I am simulating Heat Exchanger. I have tried and tested all the methods to resolve this issue from the internet like refining mesh, improving skewness and orthogonal quality ,extending outlet to...

01 March 2021 6,985 3 View

How to show arrows over the streamlines in CFD-post?

I follow this to make streamlines like the photos attached below: (software- CFD post-processing) First I plot the 2D streamline over a surface "streamline 1". them I plot a vector by the...

01 March 2021 8,668 3 View

How to increase mesh quality of a cfd model in ansys fluent?

How can one improve mesh skewness, orthogonality, aspect ratio?

28 February 2021 7,730 3 View

How to model the battery pack in PSIM or PSCAD?

Hello, I have simulated a single battery cell using Thevenin equivalent circuit. For a battery pack, I have a large number of cells connected in series and parallel connections. Is there any way...

28 February 2021 2,116 1 View

How to find the right number of integration points in second order 3d finite elements?

I am familiar with finite element simulations and numerical schemes like the Gauss Legendre quadrature. I also know that the Gauss integration yields exact values for polynomials up to degree 2n-1...

27 February 2021 6,818 3 View

High aspect ratio hexahedral mesh optimization solver?

I am interested in evaluating mesh optimization solvers that converge to high aspect ratio unstructured hexahedral grids. In other words, I am interested in a solver that optimizes warpage,...

26 February 2021 7,279 2 View

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I am trying to find how to know the density needed for a pva electrospinning in a 0.6mm neddle, the electrospinning will be from top to bottom and the problem I really have is the solution because...

25 February 2021 2,615 3 View