In order to find a better swimming hand shape, fluid mechanics scientists conducted computational fluid dynamics numerical simulations (CFD) on the palms in uniform flow. The results showed that the resistance coefficient of the palm was slightly higher than 0.5. Therefore, the force on a rapidly waving palm is approximately F = 0.5 × drag coefficient × air density × palm projected area × speed squared. (Here it is assumed that the calculation results of the resistance coefficient in water can also be applied to objects in the air.
Let's calculate the pressure when pressing the breast and breast. According to measurements, the Young's modulus of fat and fibrous glands perpendicular to the surface of a healthy breast and breast is about 3.25 kPa. Therefore, the pressure P felt by the palm per unit area = Young's modulus × corresponding pressing distance/total thickness of breast and breast.
Let the air resistance and pressing force balance (so weird Calculation), we get?F=P*palm area, that is, 0.5×Drag coefficient Total thickness) ^1/2.
If you want to press 2 mm into a 10 cm thick breast, then your palms will move at a speed of 14 meters per second or 50 kilometers per hour. Then it is said that stretching out the hand in the car is like stroking the breast. Fang's statement seems to be reasonable. If the wrist is rotated, the linear speed must be at least close to this speed to simulate a similar force situation.
In order to further seek benefits for diaosi, let us not only consider the result of the same force, but also look at how to improve the reality of the entire force process. The force of the breast is a quadratic function of the depth of the press. The swing speed and the pressing distance are related by the square root, so the relationship between the swing speed and the pressing force is likely to be linear. As for how hard you want to use to touch the breasts, how fast you want to swing it is done. This simulation process is more fun, so the functional relationship is there, you can do whatever you want.
In addition, because the sizes of the palms in the formula are approximately equal to each other, the area of the palm has no effect on this YY, but according to the numerical simulation results, the size of the fingers is different. Width still affects resistance. So, if you are interested, you can try which hand shape is the most laborious to swing? Fully open, fully closed, or half open and half closed. As for the feel, I believe that the airflow is the same. Much smoother than human skin
