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A concept combustion chamber, in which an electrospray interacts with electrostatic forces applied on the boundaries, is used to simulate the mixture preparation in a Direct Injection Spark Ignition (DISI) engine. The study is made in a 2D axisymmetric enclosure, which reflects a motored engine operating with an electrostatic atomizer previously investigated for application in fuel burners [1]. Using a rewritten version of a research CFD code [2], the transition injection mode has been chosen given that it integrates the two basic modes of operation of DISI engines [3]. Three pulses of 5 mg each are made at crank angles of 80, 150 and 300 °ATDC of the intake, these falling within the intervals for stable combustion of either early or late injection modes of operation of DISI engines. Over the half engine cycle simulated, the effects of charge are qualitatively studied with use of an uncharged spray as the benchmark.