# Reynolds Number for CFD Engineers

Reynolds number is one of the most important dimensionless numbers used by Fluid dynamists and CFD Engineers. It is the ratio of inertia force to the viscous force exerted on the fluid elements.

In this video blog, the fundamental principles of the Reynolds number and its application for CFD simulations are explained in detail. Reynolds number is used right from mesh preparation, finding the value of first cell thickness through y+, calculating turbulence intensity, heat transfer coefficient for boundary conditions, finding the value of friction coefficient, scaling, and post-processing/analyzing the CFD results. So, without any doubt, the Reynolds number is the most imperative non-dimensional number for CFD Engineers and fluid dynamists. For more insight watch the full video below.

Here, is the density of the fluid, V is the velocity of flow, L is the characteristic length and is the dynamic viscosity of fluid.

Watch the full video to know how CFD Engineers use Reynolds number starting from pre-processing to post processing and analysing the results.

## Suhas V Patankar and SIMPLE Algorithm

Professor Suhas V Patankar was born on 22 Feb 1941 in India (Pune, Maharashtra) and is known for his ground breaking contribution to the field of Computational fluid dynamics through the introduction of the SIMPLE Algorithm along with his supervisor Prof. Brain Spalding [1]. SIMPLE algorithm revolutionized CFD, the numerical simulation of fluid flow, making it more accurate efficient, and useful for the industry. Moreover, his pioneering work in finite volume methods provided engineers and researchers with a robust framework for tackling complex fluid dynamics problems.

## Unveiling the Power of Dimensional Analysis

In the realm of science, understanding and predicting the behavior of natural phenomena is a fundamental pursuit. This pursuit often involves employing a variety of problem-solving techniques to derive insights and verify the accuracy of results. One such indispensable tool in the scientistâ€™s toolkit is dimensional analysis. This technique plays a pivotal role in ensuring the validity of formulas, estimating quantities, and unraveling hidden relationships among various physical parameters. In this blog post, we delve into the significance of dimensional analysis, exemplified by the work of G.I. Taylor, who harnessed this method to estimate the explosive energy of the Trinity Test, marking a remarkable application of this mathematical approach.

## Magnus effect on a rotating soccer ball

The flight of a ball is vital across various sports, including soccer, golf, baseball, cricket, tennis, and volleyball. Research into the aerodynamics of sports balls traces back to 1672 when Newton observed deviations in tennis ball flight. Important fluid mechanics principles encompass boundary layer flow, turbulence, rough surface effects, the Magnus Effect, and wake characteristics. Mastery of these conceptsâ€™ benefits equipment designers, players, coaches, and governing bodies.Â

## Brian Spalding

Professor Brain Spalding was a distinguished academic and mechanical engineer from Britain, who was renowned for his significant contributions to computational fluid dynamics (CFD) and heat transfer. Born in 1923, he received his education from the Imperial College of London and later served as a professor and Head of the Thermodynamics Division there. B. Spalding is well-known for his pioneering work in developing numerical methods for solving complex fluid dynamics problems, which have had a profound impact on engineering design and analysis, leading to the widespread use of CFD in diverse applications. He received several accolades and honors, including the ASME Heat Transfer Memorial Award, the Medal of the Japan Society of Mechanical Engineers, and the Rumford Medal of the Royal Society, for his outstanding research contributions.

## Ludwig Prandtl

Prof. Ludwig Prandtl is known as a physicist who revolutionized fluid dynamics with his notion that the effect of friction is experienced only very near an object moving through a fluid. The modern fluid dynamics and aerodynamics world is based on this great scientist’s idea. His seminal paper which he presented in 1904 at the third international mathematics congress in Heidelberg is regarded as equivalent to that of the seminal paper of Albert Einstein and deserved a Nobel Prize in classical physics.

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