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1. Derive Bernoullis principle (compressible, ideal fluid) The ideal fluid is incompressible. The ideal fluid is an absolutely incompressible and completely non viscous liquid. The Bernoulli equation is derived from an ideal gas. If we want to consider that gases can be compressed and have friction, it is obviously not possible to solve it using Bernoullis equation, and usually requires gas kinetic theory. In fact, the Bernoulli equation (considering at most the drag and velocity distribution function) can solve the lift of the model airplane. If an accurate solution is needed, it must be achieved through experimentation and statistical analysis, or by using computer models. Theory is not omnipotent, otherwise why build a wind tunnel? Theoretical calculations can solve it. It seems that the derivation of Bernoullis equation does not require differential equations, and even if it is needed, it is very simple. How could it not be understood? Addendum: To supplement a derivation of ordinary physical rock formations, click on the image to enlarge. 2. English words related to Chinese geography. Aquifer, drainage, discharge, discharge, backflow curve, back water curve, pressure head, flow cross-section, open channel flow, orifice flow, empirical flow, non pressure flow, free surface flow, pressure flow, slow flow, subcritical flow, flow velocity below the critical value. Super critical flow refers to a flow with a velocity greater than the critical value. Gradual varied flow, rapidly varied flow, critical flow, density current, gravity flow, weir flow, gravity flow, mixed flow, aerated flow, sediment laden flow, sediment laden flow, sediment laden flow, precipitation curve, drop curve, sediment sediment sediment, sedimentation rate, settling velocity, velocity, flow stability, flow instability, Orr Sommerfeld equation, vorticity equation, vorticity equation, Poiseuille flow, Oseen flow, shear flow, shear flow, viscous flow. Visual flow laminar flow separated flow secondary flow Secondary flow: Near field flow, Far field flow, Stagnation flow, Wake flow, Backflow, Reverse flow, Jet, Free jet, Pipe flow, Tube flow, Internal flow, Coherent structure, formerly known as "coherent structure". Sudden process, burning process, apparent viscosity, motion viscosity, kinematic viscosity, Poise, Centipoise, Centipoise, Centistoke, shear layer, shear layer, sublayer, flow separation, flow separation, laminar separation, laminar separation, turbulent separation, equilibrium separation, turbulent separation, separation point, separation point, attachment point, reattachment point, re laminar flow, relaxation, starting vortex, starting vortex, standing vortex, vortex breaking vortex, breaking vortex shedding, vortex shedding, pressure drop, pressure drop, resistance, drag, pressure energy, pressure energy. Y-shaped drag profile slip velocity slip velocity Non slip condition wall shear stress skin friction, frictional drag wall shear velocity friction velocity, also known as "frictional sparrow velocity". Friction loss, friction factor, dissipation, diffusion, lag, similarity, solution, local similarity, gas lubrication, gas lubrication, liquid dynamic lubrication, good judgment, hydrodynamic lubrication, slurry slurry, Taylor number, Navier Stokes equation, Newtonian fluid, boundary layer theory, boundary layer equation, boundary layer equation, boundary layer boundary layer, boundary layer, boundary layer with solid walls. Laminar boundary layer, turbul

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