Reduced D Airways Elements
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The following elements are used for this kind of elements:

- MAT_fluid
- MAT_0D_MAXWELL_ACINUS_OGDEN
- MAT_0D_MAXWELL_ACINUS_NEOHOOKEAN
- MAT_0D_MAXWELL_ACINUS_DOUBLEEXPONENTIAL
- MAT_0D_MAXWELL_ACINUS_EXPONENTIAL