The BC is not exterior surface Answered

Hi,

The picture is my BC . The print file says boundary is not exterior surface and k =2.But my model is 2D.The k should be equal  to 0.Why does it say k=2 when the BC is set like this?

If I set the BC to following,the absorbing boundary doesn't absorb ultrasonic and will report  'bad value' error.

boun
side xmin free
side xmax absr
side ymin free
side ymax absr
end

How should I set the BC?

Best regards,

Enclosed here is the node list.

          x1                   (  real   ) =    0.000000    
x2 ( real ) = 0.8000000E-03
x3 ( real ) = 0.8608000
x4 ( real ) = 0.8618000
idx ( integer ) = 4
xmax ( real ) = 0.8618000
y1 ( real ) = 0.000000
y2 ( real ) = 0.1625000E-01
y3 ( real ) = 0.3625000E-01
y4 ( real ) = 0.4625000E-01
y5 ( real ) = 0.6625000E-01
y6 ( real ) = 0.7625000E-01
y7 ( real ) = 0.9625000E-01
y8 ( real ) = 0.1062500
y9 ( real ) = 0.1262500
y10 ( real ) = 0.1362500
y11 ( real ) = 0.1562500
y12 ( real ) = 0.1662500
y13 ( real ) = 0.1862500
y14 ( real ) = 0.1962500
y15 ( real ) = 0.2162500
y16 ( real ) = 0.2262500
y17 ( real ) = 0.2462500
jaend ( integer ) = 17
y18 ( real ) = 0.3300000
jdx ( integer ) = 18
ymax ( real ) = 0.3300000
i1 ( integer ) = 1
i2 ( integer ) = 9
i3 ( integer ) = 8072
i4 ( integer ) = 8081
indgrd ( integer ) = 8081
j1 ( integer ) = 1
j2 ( integer ) = 153
j3 ( integer ) = 341
j4 ( integer ) = 435
j5 ( integer ) = 622
j6 ( integer ) = 716
j7 ( integer ) = 903
j8 ( integer ) = 997
j9 ( integer ) = 1184
j10 ( integer ) = 1278
j11 ( integer ) = 1465
j12 ( integer ) = 1559
j13 ( integer ) = 1746
j14 ( integer ) = 1840
j15 ( integer ) = 2027
j16 ( integer ) = 2121
j17 ( integer ) = 2308
j18 ( integer ) = 3093
jndgrd ( integer ) = 3093

3 comments

  • Absorbin boundary conditions need to be placed on the extents/exterior/limits of the model you have specified the nodal location i3-1 looking at your node map i4 lies on the exterior of the model.

    Comment actions Permalink
  • I understand.But the node i3 is the boudary of the geometry and the i4 is the boundary of the model.If I  set both of them absr, it the i3 absorbing boundary doesn't absorb ultrasonic and will report  'bad value' error. 

    Comment actions Permalink
  • What model is this for we are currently looking at or plan to look at other models you have shared, just to gie me a better understanding of the variables you posted above

    Comment actions Permalink

Please sign in to leave a comment.

Didn't find what you were looking for?

New post