To provide a multi-layer fluid analysis program, a multi-layer fluid analysis system, and a multi-layer fluid analysis method, capable of analyzing a multilayer fluid in a flow direction (MD direction) and a width direction (TD direction) with high accuracy by a 2.5-dimensional analysis.SOLUTION: A multi-layer fluid analysis program analyzes a state change of a multi-layer fluid as a 2.5-dimensional element in which each layer is divided into elements and information on layer thickness is given to the elements in a finite element model of multi-layer fluid. The multi-layer fluid analysis program includes: a layer thickness calculation step of calculating a layer thickness of an element from simultaneous equations showing a relationship between stress in a normal direction of the element and fluid viscosity under a condition that stress in normal and tangential directions at an interface of each layer are balanced and a flow velocity at an interface is continuous; and a display step of displaying a calculation result of the layer thickness calculation step for each layer in a flow direction and a width direction of the multi-layer fluid.SELECTED DRAWING: Figure 8
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