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imposing normal velocity on wall boundary

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Old   September 14, 2012, 01:12
Default imposing normal velocity on wall boundary
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Some problem drives me crazy.

i tried to solve oscillating plate of speaker.(transient)

Can i impose normal velocity(not tangential) on stationary wall boundary?

if not, please allow me to know which method is appropriate

i already used 'morper' but the magnitude of displacement is too high relative to mesh size, so after several iteration/time step my solver diverged, generating negative volume mesh.

my 2D, axisymmeric model is attached. and oscillation velocity is bellow,

x-direction : 0.01*2*3.14159/0.01*cos(2*3.14159/0.01*time) [m/s]

Any help can save my life.

thank you
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