*Heading
 Inner air model for *FREQUENCY analysis
 M, KG, S
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**
** PART INSTANCE: InteriorAir-1
**
*Node, input=muffler_intair_nodes.inp
*Element, type=AC3D10, input=muffler_intair_elem.inp
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*Elset, elset=InteriorAir-1_I1, generate
*Solid Section, elset=InteriorAir-1_I1, material=airabsorb
 1.,
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*Elset, elset=InteriorAir-1_I2, generate
*Solid Section, elset=InteriorAir-1_I2, material=air
 1.,
** ----------------------------------------------------------------
*Elset, elset=_innerairoutlet_S4
*Surface, name=innerairoutlet
_innerairoutlet_S4, S4
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**
** MATERIALS
**
*Material, name=air
*Acousticmedium,bulkmodulus
*Density
 1.2,
*Material, name=airabsorb
*Acousticmedium,bulkmodulus
*Acousticmedium,volumetricdrag
*Density
 1.2,
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**
** STEP: Step-1
**
*Step
 Step-1: Frequency Analysis
*Frequency,eigensolver=lanczos
 10,10.,,1.
*End step