  Nonhelical hydromagnetic forced turbulence is investigated using large scale
simulations on up to 256 processors and $1024^3$ meshpoints. The magnetic
Prandtl number is varied between 1/8 and 30, although in most cases it is
unity. When the magnetic Reynolds number is based on the inverse forcing
wavenumber, the critical value for dynamo action is shown to be around 35 for
magnetic Prandtl number of unity. For small magnetic Prandtl numbers we find
the critical magnetic Reynolds number to increase with decreasing magnetic
Prandtl number. The Kazantsev $k^{3/2}$ spectrum for magnetic energy is
confirmed for the kinematic regime, i.e. when nonlinear effects are still
unimportant and when the magnetic Prandtl number is unity. In the nonlinear
regime, the energy budget converges for large Reynolds numbers (around 1000)
such that for our parameters about 70% is in kinetic energy and about 30% is in
magnetic energy. The energy dissipation rates are converged to 30% viscous
dissipation and 70% resistive dissipation. Second order structure functions of
the Elsasser variables give evidence for a $k^{-5/3}$ spectrum. Nevertheless,
the three-dimensional spectrum is close to $k^{-3/2}$, but we argue that this
is due to the bottleneck effect. The bottleneck effect is shown to be equally
strong both for magnetic and nonmagnetic turbulence, but it is far weaker in
one-dimensional spectra that are normally studied in laboratory turbulence.
Structure function exponents for other orders are well described by the
She-Leveque formula, but the velocity field is significantly less intermittent
and the magnetic field is more intermittent than the Elsasser variables.
