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This page contains articles written for cfdyna.com by guest authors, bloggers, hobbyists on topics such as project management, solar energy, green technology, mathematics, data analytics, statistics and reliability. The topics related to mechanical engineering and numerical simulations have been kept out of this list. Inf you have a topic and article which you wish to publish on this webpage alongwith your name and contact details, pleaselet us know and we will add it on this web page.


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Mathematics: Tips, Tricks, Brain Twisters

This blog contains topics related to basic maths tricks, puzzles, short-cut techniques like acronyms and mnemonics.

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Physics: Solved Examples

Refer to this page to access example problems in mechanics, simple harmonic motions, vibrations, collisions at college physics level.

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Advance Physics

Relativity, Super-conductivity, Quantum Mechanics! […]


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Quiz: Aptitute Test

Quantitative Aptitude Test for Banking, SSC

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Indian Stock Market and Trade Tiger

Tips and Tricks in Trade Tiger, Outlook and Views on Indian Stock Market

False Dichotomy of Team Work

A misconception called "team spirit" - having teams is a pratical compulsion. At the same time, the words and concepts like team-spirit, team work ... are overused and abused. In cricket, have you heard of "best batting pair of the match" but there is "man of the match", have you noticed reward of best "bowling team" but there is "highest wicket taker of the series". In football, have you heard of the best "team of defenders" or "team of strikers" but there is recognition for "best defender" or "best striker".

  Most of the teams are not able to realize the full potential because the team is not able to maintain the identity of each individual and not able to define and assign the activities as per the strengths and temperament of the members.


Productivity definition and drawbacks

Britain's last coal power plants to close by 2025 (www.theguardian.com), Jet Airways leaves 350 pilots high and dry - cuts salary citing lesser workload (economictimes.indiatimes.com), Mario Draghi faces easing dilemma as strong euro sparks concern (www.investing.com). One may ask how these three distinct piece of news headline are related? They are not related indeed, but pointing a distant trouble looming and ballooning in subtle way! We are entering into era of extremely high productivity! And the rewards for inefficiencies will be higher in future than the rewards for higher productivity. There is rush for the countries to keep their currency weaker than others (a sign of low local demand, high efficient, high productivity but less consuming economy).

Coming back to the topic of productivity, there are reports and articles describing (not explaining) the superiority of certain geographical regions in terms of productivity of human capital. Most of them do not distinguish the working conditions or portray the complete picture. Say, how can a revenue per employee of $2000/hour in European countries be compared to revenue of $500/hour in India? What are the other factors to be considered and in what fraction and weightage? How does salary, level of automation, skill, the price of the prodcuts and local market conditions affect the value "revenue per employee"?

On a scientific note, a worker in cold climate will tend to be more productive compared to another worker (same age, skill and nature of job). A thermodynamic evaluation of the "human machine" will justify this as per Carnot cycle. Human body is a constant temperature heat source where its metabolic activity and temperature control system maintains it close to 37 [°C]. Lower the ambient temperature where heat is rejected, higher will the efficiency of the human machines.


Engineering Expertize vs. Tool Skill

An interior designer for household application needs to know basic of carpentry. Utimately his designs has to be converted into tangible products using contemporary manufacturing processes and material in a cost effective manner. Does this mean carpentry is a bad profession and interior designing is high-end profession? The anwer is clearly no. Both are specialization in their own essence and complement each other for a better product - the stylish, durable and user-friendly home interiors.

Similar analogy holds true in case of a "CAD modeling engineer" and a "product design engineer" or a "FEA Analyst" and "Strctural Integrity Engineer" or a "CFD Analyst" and a "Thermal and Fluid Engieer". CAD Designer is an specialization so is any "FE and CFD analysis" work within their own boundaries. Sometimes we do not want to associate the term 'engineer' or 'engineering' with CAD modeling related stuff. This is required to keep the activities of "product design" and "process of graphical representation of product" distinguishable. While a product design process involves finding answers like "why the dimension and tolerance of the product should have certain value", CAD modeling involves a method to represent the dimensions as per standards and conventions in place. Similarly, a design engineer may not need to know why and how a FE or CFD simulation is performed, he must know what is needed to carry out such simulations and what outputs from those simulation is needed to ensure his design meets the required specifications. On the same note, an FEA or thermal simulation engineer is not required to know why product is designed the way it is shaped and sized, he must know the key performance parameters which is to be validated to help the design engineer make informed decision.

Steps of product design


SMART Rating

SMART rating definitions

Manager Type

Types of Managers

Johari Window

This technique proposes to make the central white box as wide as possible.

Types of Managers


Meeting invites and inbox clean-up

The e-mail technology has revolutionalized communication and exchange of information. It has become a tool to provide information and data quicker maintaining history, correctness and authenticity. It has wider (sometimes uncontrolled) reach to audiences / recepients.

However, with changing technology the impact and effect of e-mails need to be periodically reviewed and necessary corrective and preventive actions need to be implemented across the organization. New users as well as existing users need to be re-trained and explained the limiations and forthcoming challenges. One of the key challenge is size of inboxes which need to be pruned by deleting obsolete contents. Some of them are meeting acceptance or decline messages, meeting messages which remain in d'eleted' folder, birth day wishes (birthday wishes for 2018 can be deleted after next birth day in 2019)! A machine learning alogorithm can be developed to identify such obsolete messages, similar to the way spam messages are filtered now-a-days.

With increasing use of carbon copies (CC list), the inbox sometimes get flooded beyond human capability to read and respond. An ever increasing trend to put receipients as optional in meeting invites pose even greater threat to the efficiency and effectiveness of key roles. The calendars remain virtually full and employees of all levels do not show courage or willingness to send the 'decline' responses when they think their presence are not needed. Most of the meeting invites I receive now a days have more number of optional attendees than required attendees.

Following steps are needed to address this problem before it becomes a burden:

  • A meeting invitation cannot be generated if the schedule is in conflict with more than 50% of the participants.
  • No meeting should be generated or accepted if it does not have a well-defined agenda.
  • If you are not able to attend, 'decline'! Organizations need to find out what is preventing people from not responding to the meeting invites?

Fun World


Wrong e-mail address: The husband checked into the hotel. There was a computer in his room, so he decided to send an e-mail to his wife. However, he accidentally typed wrong e-mail address, and without realizing his error, he sent the e-mail. Meanwhile.....somewhere in Houston, a widow had just returned home from her husband's funeral. He was a minister of many years who was called home to glory following a sudden heart attack. The widow decided to check her e-mail, expecting messages from relatives and friends.

After reading the first message, she fainted. The widow's son rushed into the room, found his mother on the floor, and saw the computer screen which read:

> To: My Loving Wife
> Subject: I've arrived
> Date: 16 May 2002
> I know you're surprised to hear from me. They have computers here now, and you are allowed to send e-mails to your loved ones. I've just arrived and have been checked in. I see that everything has been prepared for your arrival tomorrow. Looking forward to seeing you then! Hope your journey is as uneventful as mine was.
Salesman in Arab: The disappointed salesman of Coke returns from his Middle East assignment. A friend asked, "Why weren't you successful with the Arabs?"

The salesman explained, "When I got posted in the Middle East, I was very confident that I will make a good sales pitch as Coca Cola is virtually unknown there. But, I had a problem I didn't know to speak Arabic. So, I planned to convey the message through 3 posters. First poster was of a man crawling through the hot desert sand totally exhausted and panting. Second, the man is drinking our Cola and Third, our man is now totally refreshed. Then these posters were pasted all over the place".

"That should have worked", said the friend."

He replied, "Well, I didn't know Arabic, neither did I realize that Arabs read from right to left."


Funny responses:

How can you drop a raw egg onto a concrete floor without cracking it?

  • Concrete floors are very hard to crack!

If it took eight men ten hours to build a wall, how long would it take four men to build it?

  • No time at all! It is already built.

If you had three apples and four oranges in one hand and four apples and three oranges in the other hand, what would you have?

  • Very large hands.

How can you lift an elephant with one hand?

  • It is not a problem, since you will never find an elephant with one hand.

How can a man go eight days without sleep?

  • He sleeps at night.

If you throw a red stone into the blue sea what it will become?

  • It becomes wet.

What looks like half apple?

  • The other half.

What happened when wheel was invented?

  • It caused a revolution.

Why is it easy to weigh a fish?

  • Because it has its own scales!

Why does a bike rest on its leg?

  • Because it is too tired!

Bay of Bengal is in which state?

  • Liquid
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The content on CFDyna.com is being constantly refined and improvised with on-the-job experience, testing, and training. Examples might be simplified to improve insight into the physics and basic understanding. Linked pages, articles, references, and examples are constantly reviewed to reduce errors, but we cannot warrant full correctness of all content.