Computer readable storage medium storing multilayer fluid analysis program, multilayer fluid analysis system, and multilayer fluid analysis method

A multilayer fluid analysis system for analyzing a multilayer fluid on a feed block type T-die as 2.5 dimensions in which each layer is divided into elements and each of the elements has information about a layer thickness in a finite element model for the multilayer fluid, the multilayer fluid analysis system comprising:

• a layer thickness calculation unit for calculating the layer thickness under a condition that stresses in a normal direction and a tangential direction equilibrate on an interface of each layer and a flow velocity on the interface is continuous, without considering a fluid flow in a thickness direction of the layer thickness, considering a viscoelastic effect of the multilayer fluid to analyze an encapsulation phenomenon in a feed block on a downstream side of a junction of each layer, and based on a shape of a rectangular cross section of the feed block and a second normal stress difference of resin in the feed block assuming that the layer thickness in a transverse direction fluctuates in a developmental state;
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• a display unit for displaying a calculation result of the layer thickness calculation unit for each layer in the transverse direction and a machine direction of the multilayer fluid from an upstream side of the junction of each layer to the downstream side of the junction.

A multilayer fluid analysis method for analyzing a state change of a multilayer fluid on a feed block type T-die as 2.5 dimensions in which each layer is divided into elements and each of the elements has information about a layer thickness in a finite element model of the multilayer fluid, the multilayer fluid analysis method comprising:

• a step of calculating the layer thickness under a condition that stresses in a normal direction and a tangential direction equilibrate on an interface of each layer and a flow velocity on the interface is continuous, without considering a fluid flow in a thickness direction of the layer thickness, considering a viscoelastic effect of the multilayer fluid to analyze an encapsulation phenomenon in a feed block on a downstream side of a junction of each layer, and based on a shape of a rectangular cross section of the feed block and a second normal stress difference of resin in the feed block assuming that the layer thickness in a transverse direction fluctuates in a developmental state;
• and
• a step of displaying a calculation result of the step of calculating the layer thickness for each layer in the transverse direction and a machine direction of the multilayer fluid from an upstream side of the junction of each layer to the downstream side of the junction.