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MOND is an empirically motivated theory using modified gravity to reproducemany astronomical observations without invoking the dark matter hypothesis.Instead of falsifying the existence of dark matter, we propose MOND is aneffective theory naturally emerging from the long-range interaction andcollisionless nature of dark matter flow. It describes the dynamics of baryonicmass suspended in fluctuating dark matter fluid. The long-range interactionrequires a broad size of halos to be formed that facilitate inverse mass andenergy cascade with a constant rate of cascade $\varepsilon _{u} \approx-4.6\times 10^{-7}{m^{2}/s^{3}}$. In addition to the velocity fluctuation witha typical scale $u$, the long-range interaction leads to fluctuation inacceleration with a typical scale $a_{0}$. The velocity and accelerationfluctuations satisfy $\varepsilon_{u}=-{a_{0}u/(3\pi)^{2}}$ due to energycascade, where factor $3\pi$ is from the angle of incidence. With $u_{0} \equivu(z=0)\approx 354.61{km/s}$, $a_{0}(z=0)\approx 1.2\times 10^{-10}{m/s^{2}}$can be easily obtained. While Planck constant $\hbar$, gravitational constant$G$, and $\varepsilon_{u}$ are proposed to find the dark matter particleproperties on the smallest scale, $u$, $G$, and $\varepsilon_{u}$ determinehalo properties on the largest scale. For given particle velocity $v_{p}$,maximum entropy distributions of dark matter flow lead to kinetic energy$\varepsilon_{k} \propto v_{p}$ for $a<a_{0}$ and $\varepsilon_{k} \proptov_{p}^{2}$ for $a>a_{0}$. Combining this with constant $\varepsilon_{u}$,Newtonian dynamics and "deep-MOND" behavior can be fully recovered. A notablecoincidence of cosmological constant $\Lambda \propto ({a_{0}/c})^{2}$ or alinear relation for light speed $c=(3\pi)^3u_0$ might point to an entropicorigin of dark energy from acceleration fluctuation with its density$\rho_{vac} \propto {a_{0}^{2}/G}$.

The origin of MOND acceleration and deep MOND from acceleration fluctuation and energy cascade in dark matter flow