Time

Time is set in the ddtSchemes dictionary in the system/fvSchemes file.

If Time is steady, the pressure-based solver uses steadyState for single-phase flows and localEuler for two-phase flows. Density-based solver uses localEuler.

ddtSchemes
{
    default     <steadyState or localEuler>;
}

If Time is transient, use Euler for First Order Implicit and backward for Second Order Implicit.

ddtSchemes
{
    default     <Euler or backward>;
}

Gravity

Set the input vector of gravity in the constant/g file as follows

dimensions  [0 1 -2 0 0 0 0];
value       (<x-value> <y-value> <z-value>);

Operating Conditions

Set the input value of Operating Conditions in constant/operatingConditions file as follows

operatingPressure operatingPressure [1 -1 -2 0 0 0 0]   <value>;