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Turbulence driving

The block named &TURB_PARAMS contains the parameters related to the turbulence driving. Originally implemented by Andrew Mcleod

Variable name	Fortran type	Default value	Description
`turb`	`boolean`	`.false.`	Turn on or off driving
`turb_seed`	`integer`	`-1`	Random number generator seed. -1 = random
`turb_type`	`integer`	`1`	How the driving changes over time. 1=driven evolving, 3=decaying
`instant_turb`	`boolean`	`.true.`	Generate initial turbulence before start
`comp_frac`	`float`	`0.3333`	The weight of compressive over solenoidal modes
`turb_T`	`float`	`1`	Turbulent velocity auto-correlation time in code units.
`turb_Ndt`	`integer`	`100`	Number of timesteps per auto-correlation time
`turb_rms`	`float`	`1`	Root-mean-square turbulent forcing in code units.
`turb_min_rho`	`float`	`1d-50`	Minimum density for turbulence. Not forcing is added onto cellswith a density less than this value.
`forcing_power_spectrum`	`string`	`parabolic`	Power spectrum type of the forcing, which describes the relative strength of individual modes. Options are: power_law, parabolic, konstandin