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Main Menu > Define > Models > Solver
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Under Time, select Unsteady. We will use the default 1st-Order ImplicitUnsteady Formulation for for now. Click OK.

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For all flows, FLUENT uses gauge pressure internally. Any time an absolute pressure is needed, it is generated by adding the operating pressure to the gauge pressure. We'll use the default value of 1 atm (101,325 Pa) as the Operating Pressure.

Click Cancel to leave the default in place.

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