Solving
The dependent variables of the transport equations solved by the Electric Discharge interface are expressed in logarithmic form. The initial condition for the carrier number density cannot be zero and is set to a finite small value by default. For transient models, it is often necessary to add an Electrostatics Initialization study step before the Time Dependent study step such that the transient study has good and consistent initial values.
Note also that the solution from one study can be used as the starting point for a second study by altering the settings in the Values of Dependent Variables section of the Stationary study step. To do this, select the Initial values of variables solved for checkbox, select Solution for the Method, and then select the appropriate solution from the Study list.
In the COMSOL Multiphysics Reference Manual:
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Introduction to Solvers and Studies
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Study and Study Step Types
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Computing a Solution
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Solution Operation Nodes and Solvers