*Heading
 Inner air model for *FREQUENCY analysis
 M, KG, S
** ----------------------------------------------------------------
** 
** PART INSTANCE: InteriorAir-1
** 
*Node, input=muffler_intair_nodes.inp
*Element, type=AC3D10, input=muffler_intair_elem.inp
** ----------------------------------------------------------------
*Elset, elset=InteriorAir-1_I1, generate
  549,  1457,     1
*Solid Section, elset=InteriorAir-1_I1, material=airabsorb
 1.,
** ----------------------------------------------------------------
*Elset, elset=InteriorAir-1_I2, generate
   1,  548,    1
*Solid Section, elset=InteriorAir-1_I2, material=air
 1.,
** ----------------------------------------------------------------
*Elset, elset=_innerairoutlet_S4
 288, 299, 367
*Surface, name=innerairoutlet
_innerairoutlet_S4, S4
** ----------------------------------------------------------------
** 
** MATERIALS
** 
*Material, name=air
*Acousticmedium,bulkmodulus
 1.42e5,
*Density
 1.2,
*Material, name=airabsorb
*Acousticmedium,bulkmodulus
 1.42e5,
*Acousticmedium,volumetricdrag
 1.2,
*Density
 1.2,
** ----------------------------------------------------------------
** 
** STEP: Step-1
**
*Step
 Step-1: Frequency Analysis
*Frequency,eigensolver=lanczos
 10,10.,,1.
*End step