# Traditional (Density-Entropy) SPH¶

Traditional, GADGET-2-like, Density-Entropy SPH is available in SWIFT with a Monaghan artificial viscosity scheme and Balsara switch.

To use this hydro scheme, you need no extra configuration options – it is the default!

As it uses a very simple, fixed artificial viscosity, only the SPH:viscosity_alpha parameter has any effect for this scheme. This will change the strength of the artificial viscosity throughout the simulation, and has a default of 0.8.