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[Solution]

Fluent sometimes creates Iso-Surface to create a plane cross section (Mesh-X / Y / Z-Coordinate). We will explain the sign when Mass Flow Rate is calculated by Surface Integrals for this plane. Unlike the interior surface, plane surface, and imprint surface, Iso-Surface has no surface normal direction. Depending on the direction of the coordinate axis and the main flow direction, the positive / negative is determined as follows: When the main flow direction of the flow matches the vector direction of the coordinate axis (for example, flow in the positive direction of the Z axis): The main flow direction of the flow and the vector direction of the coordinate axis are opposite (for example, negative in the Z axis In the case of flow in the direction): negative value

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