In the Name of God

Energy Equation in terms of Fluid Head or Total Enthalpy

تئوری، درجات کسب دانش، یادگیری و تسلط

بسم الله الرحمن الرحیم

یک تئوری شامل دو بخش است

Part 1: Definitions-Fundamentals-Assumptions-Modelling

Part 2: Relations: Fundamentals-Theorems-Results

انسان یک تئوری را یاد میگیرد.

کسب علم شامل 5 قسمت ممکن است بشود:

1- الهام 2 مشاهده (شهود) 3-شعور و احساس 4- درک-تحلیل-یادگیری 5- دانش و mastery یا تسلط

شماره 4: درک، تحلیل و یلذگیری شامل سه بخش است: حفظ کردن، (درک) تک تک قوانین، (درک) قوانین در رابطه با هم

شماره 5: دانش و master: شامل سه بخش است: شماره 4 (یادگیری کامل)، (کسب) مهارت و (کسب) دیدگاه های مختلف؛ تمرین با حل مسائل متعدد

Theory

in the Name of God

"Theory" Structure:

A theory is built from the following materials or has a structure like:

Part 1: Definitions; Fundamentals; Assumptions; Modelling (defining variables to describe state of the system)

Part 2: Relations:

1. Fundamentals (Relations the system is defined such)
2. Theorems (Relations comes from fundamental by reasoning and derivation)
3. Results (Results of Theorems)

In the Name of God

Viscous Flow Aspects

Dealing with viscous flow assumptions, one may consider the following aspects influencing aerodynamic characteristics as well as other influencing factors:

Therefore, the viscous flow is characterized by the following aspects:

1- Viscous Stress: the velocity gradient + viscosity (indicated by Re number)

                          Furthermore, turbulence also affects both velocity gradient and viscosity

2- Pressure Loss: the pressure gradient + separation or bubbles 

Laplace Operator and Laplace Equation in Polar Coordinates

Equations of Steady Reversible Ideal Gas

Some advice for application for admission

Advice for Application for Admission to a Program at a Foreign University 

Here, you will find some advice for application for admission.

Nature of Phenomena within a System

Nature of Phenomena within a System (under Study)

1. Time (Variations) (we may consider space too.)
2. Sources and Sinks (internal and external)
3. Transport
4. Reservation
5. Converters, Elements and Medium 

Elements

1. each system element does a task with one of the previous natures listed

Components

1. Energy (and force)
2. Matter: matter serves both as the system(something under study) and also serves as elements, medium and converters

Fluid Force: Effective Parameters

1. Geometry-Angle of Attach
2. Mach number (compressibility effects)
3. Viscous phenomenon: Reynolds, Turbulence, Separation and reattachment and stall, Boundary layer parameters including Pressure gradient 

Remarks: Momentum Equation

REMARK: MOMENTUM EQUATION

The pressure waves that move with the speed of sound are like ambassadors who carry the duty of converting momentum of the fluid to pressure distribution. That is why the momentum of the particles is not directly applied/inserted to the geometry, but firstly converted to pressure and then the pressure will be integrated to calculate the force. 
This is the reason for the Newtonian theory. The flow upstream the Mach waves has not been yet converted to the pressure distribution, hence the flow only senses the momentum. There is no pressure defined and there is no body in the flow behind Mach waves. As Mach number increases, the shock wave gets close enough to the surface that the surface can be approximated by the shock wave shape. Hence, we can directly compute the force by integrating the momentum losses of the flow particles. Because there is no region within which the fluid has felt the presence of the body. 
Around the surface, because the Mach no. has a finite value, no matter how much its value is, there exists a region which encompasses the body and the pressure waves are present there. Because of this, we observe that the physics is ruled so that the flow momentum must be converted to pressure before reaching a body surface. 

Thank you,