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ANSYS Meshing – Inflation – Part 2

Inflation Option

The Inflation Option settings determine the heights of the inflation layers. The following options are available:

  • Smooth Transition – This is the default. The Smooth Transition option uses the local tetrahedral element size to compute each local initial height and total height so that the rate of volume change is smooth. Each triangle that is being inflated will have an initial height that is computed with respect to its area, averaged at the nodes. This means that for a uniform mesh, the initial heights will be roughly the same, while for a varying mesh, the initial heights will vary.The computations used for prism layer growth are as follows:
    • The following value is computed at each node on the prism base:Height of last prism (H) = Transition_Ratio * average_edge_length
    • The height of the first layer (h) is computed using the following formula, where g = Growth Rate and n = Number of Layers:H = h * (g ^ (n-1))



    Increasing the value of the Growth Rate control reduces the total height of the inflation layer. The total height approaches an asymptotic value with respect to the number of inflation layers.

  • Total Thickness – The Total Thickness option creates constant inflation layers using the values of the Number of Layers and Growth Rate controls to obtain a total thickness as defined by the value of the Maximum Thickness control. Unlike inflation with the Smooth Transition option, with the Total Thickness option the thickness of the first inflation layer and each following layer is constant.
  • First Layer Thickness – The First Layer Thickness option creates constant inflation layers using the values of the First Layer HeightMaximum Layers, and Growth Rate controls to generate the inflation mesh. Unlike inflation with the Smooth Transition option, with the First Layer Thickness option the thickness of the first inflation layer and each following layer is constant.

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