Fluid Analysis for Beginners: What is Fluid?

Around us, there are various substances that take on different states depending on the environment.
Substances that can flow and change shape freely, like gases and liquids, are generally referred to as "fluids." Fluids can be classified based on their intrinsic properties, known as "physical properties," and the characteristics of how they flow.
There are various types of "physical properties," but I will introduce two representative ones: "viscosity" and "compressibility."
Viscosity is a property that indicates whether a fluid is thick and sticky or thin and runny, and it varies depending on the material and temperature. Air and water are runny, while syrup and honey are sticky, and they are said to have high viscosity.
Compressibility is a property that indicates how easily a fluid can be compressed. Even when a fluid is flowing quickly, the effects of compressibility (the change in the fluid's volume) can be significant.
The phenomenon of shock waves occurring around fast-moving objects, such as rockets and supersonic passenger planes, is also related to the speed and compressibility of the fluid.
For information related to fluid analysis, structural analysis, optimization, and other CAE topics, please refer to the link below or feel free to contact us.

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