Original sentence: Boundary conditions are often treated by choosing fixed values at the edges, or by employing periodic boundary conditions in which one side of the simulation loops back to the opposite side, mimicking a bulk phase.Using an explicit solvent is computationally expensive, requiring inclusion of about ten times more particles in the simulation
Edited sentence: Boundary conditions are often treated by choosing fixed values at the edges (which may cause artifacts), or by employing periodic boundary conditions in which one side of the simulation loops back to the opposite side, mimicking a bulk phase.Using an explicit solvent is computationally expensive, requiring inclusion of roughly ten times more particles in the simulation