Exciting turbulence in an elongated domain

Motivated by recent experimental results in grid turbulence with very long streamwise velocity correlations, we consider numerical simulations of turbulence in a domain that is elongated in one direction. Energy is injected in the largest wavelengths of the system. Compared to turbulence in traditional cubic domains, larger Reynolds numbers, wider inertial ranges, more significant intermittency, and longer surviving large-scale motions are obtained in elongated domains. A mixed Taylor-scale Reynolds number is defined to describe the ratio between inertial and viscous dynamics for elongated turbulence.