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New answers tagged flow

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The downstream side of the nozzle is much more important to maintaining the efficiency of the nozzle by controlling expansion wave. It also influences the uniformity of the flow exiting the nozzle. Symmetry would be perfectly fine, but you'd end up making the converging section bigger than it needs to be. Here's a bit more about the design of the nozzle ...

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Related questions Why does your car lurch toward an oncoming truck as it passes you? Observer stationary A vehicle passing a stationary vehicle can produce a complex pressure wave From MEASUREMENT OF THE AERODYNAMIC PRESSURES PRODUCED BY PASSING TRAINS In this you can see that the stationary vehicle is first pushed away and then sucked back ...

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The relative speed of your car and another car does not matter since your car is affected only by air. Probable explanation. A moving car is producing a wind, blowing in nearly perpendicular direction These streams of are are similar to rain drops. And it is a subject for Galileo transform. If you stay and rain is vertical, it falls on your top. If you ...

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Mayby the moving mass of your car makes it more stabile. The same as a giroscope. The mass of a ciclist is lower so he can experiënce more swaying. Large motorhomes and caravans also sway more when a truck passes. And those are riding at about 50 m/h. So learning while writing , its a combination of surface and streamline, and the stability the moving mass ...

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As you rightly suspected, in general, if $\vec{v}_1$ and $\vec{v}_2$ are two solution of the Euler equation then $\vec{v}_1 + \vec{v}_2$ is not a solution because of the nonlinear term. However, in many cases, one (or both) of the velocities will make the nonlinear term zero allowing you to add them. For example, in the case of a steady flow in an ...

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The sound velocity depends on the sound frequency (dispersion). The flow must be locally faster than the frequency of the downstream disturbances. If the latter are such that their sound velocity is small, the local flow velocity may be chosen small too. Note, that the sound velocity depends also on the void fraction. If there are bubbles (even locally - ...

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Consider the following image, we have some fluid volume, $V$, having density $\rho$ and traveling at a velocity $v$ along a pipe with some cross-sectional area $A$. The rate at which the water flows through the pipe is called the volumetric flow rate. This is given by, $$\frac{dV}{dt}\equiv Q=\mathbf v\cdot\mathbf A$$ where $V$ is the volume of the ...

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