DrClaude said:A real fluid is a collection of molecules. At the macroscopic level, you describe the fluid as a continuous substance, emerging from the collective behavior of the molecules, but without treating it as made up of molecules. In other words, you zoom out and don't see individual molecules, just a continuous fluid.
When you do fluid dynamics, you need to consider an infinitesimally small volume of that fluid. But as you zoom back in, you don't come back to a molecule (you never consider the behavior of individual molecules). You simply take smaller and smaller amounts of the fluid, keeping the same properties as the bulk of the fluid.
In that sense, the fluid particle is not a real particle (i.e., a molecule), but an abstract particle that has the properties of the fluid.
If you mean "imaginary" in the sense "doesn't really exist," then yeah, sort of.mech-eng said:Then, does abstract mean here imaginary?
Merriam-Webster said:2 : expressing a quality apart from an object
DrClaude said:If you mean "imaginary" in the sense "doesn't really exist," then yeah, sort of.
But "abstract" is really the correct word:
Not at all. "Hypothetical" means that someone made a hypothesis that it might exist. Nobody is postulating that the fluid particle really exists, we know it doesn't. But we still use the concept of a fluid particle.mech-eng said:For years ago, I encountered with "hypothetical planet". Does abstract here also mean "hypothetical"?
A fluid particle in ANSYS simulations is an abstraction used to model the behavior of a small volume of fluid within a larger system. It is represented by a set of properties such as mass, momentum, and energy, which can change as the particle interacts with its surroundings.
A fluid particle in ANSYS simulations is considered an abstraction because it is a simplified representation of the complex behavior of real fluids. It allows for easier analysis and simulation of fluid flow, but it does not capture all the nuances and complexities of real fluids.
Fluid particles in ANSYS simulations are used to simulate the behavior of fluids within a larger system, such as in a fluid flow analysis. They are also used to track the movement and interaction of fluids with other objects or boundaries in the system.
No, a fluid particle cannot be treated as a solid particle in ANSYS simulations. Solid particles have different physical properties and behave differently than fluid particles. ANSYS simulations have separate tools and methods for modeling and analyzing solid particles.
The use of fluid particles in ANSYS simulations has certain limitations. For example, it may not accurately capture the behavior of real fluids under extreme conditions, such as at high velocities or temperatures. Additionally, it may not account for all the complexities of turbulence or multiphase flow. It is important to carefully consider these limitations when using fluid particles in ANSYS simulations.