DBEM计算TL的过程
直接边界元法计算TL直接边界元与间接边界元应用的一个区别是，计算消声器传递损失时，DBEM模型里不能有交接面，也就是所有的面都在声场的边界上，在声场内部不存在边界。IBEM模型里可有。New Name 'c-dbem' Model 1 File c-dbem.sdb Return
Option
BEM Direct Collocation Element Interior Uncoupled Frequency
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Environment Section SETUP ANSYSREVISION '5.7' Return
Environment Section SETUP MEMORY '200.000000' Return
Import Mesh Format Ansys File ibem.cdb Return
Check Mesh Set Subdomain Return
!检查网格
Reverse
!调整法线方向（如果需要）
Element All
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Set 1 Name "inlet"
！速度进口边界条件
Element Internal 75 To 87 712
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Set 2 Name "outlet"
Element Internal 88 To 100
！无反射出口边界条件
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Material Fluid
！流体材料（默认）
Name 'air'
Sound Real 3.4000e+002
Rho Real 1.2250e+000
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Boundary Velocity
Real 1 Imag 0
！速度边界条件（特别注意这里是正值）
Elements Set 1
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Boundary Impedance
Real 416.5 Imag 0
！无反射出口
Elements Set 2
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Save Return
Solve
Frequency 20 To 3000 LinStep 10
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Show Dialog File/Read return
Read File
v-post.cmd
Point
2.049164e-3 -7.2867977e-3 8.1355395e-34 Return
!场点定义在节点上（注意这点比较关键，特别是进口场点的位置，因为计算TL时要用到进口速度，当然也可以定义的其他的点，只是速度要读取，并要注意速度方向）
Point
-4.434042e-3 -7.4579693e-3 0.21 Return
PostProcess
Points All
Frequency 20 To 3000 LinStep 10
Near 2
Far 5
Quadrature 2 2 1
Save Results Step 1
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Combine
Read point 2 Pressure Return
Read point 2 Pressure Return
Conjugate
Multiply
Root
Real
Write Table 20 Name 'Pout' Return
Clear
Read point 1 Pressure Return
Constant Real 416.5 Imag 0
Constant Real 1 Imag 0
Multiply
Add
Read point 1 Pressure Return
Constant Real 416.5 Imag 0
Constant Real 1 Imag 0
Multiply
Add
Conjugate
Multiply
Root
Constant Real 2 Imag 0
Divide
Real
Write Table 21 Name 'Pin' Return
Clear
Read Table 20 Return
Read Table 21 Return
Divide
Square
Log10
Constant Real 10 Imag 0
Multiply
Write Table 22 Name 'TL-HZ1' Return
Return
Curve
Table 22
Format
1
NoBackground
Marker 0
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