Discussion Forum

Hello,
I am using comsol 4.0a to analysis Speaker parts (3D, modeling Pro Engineering).

But when I try to solve this problem, comsol solver show me the error in below.

What does this error mean ?
(I want to COMSOL 'Loudspeaker Driver' example using this 3D Speaker parts)

--------------------------------------------------------------------------------------------------------------------------------------------------------------

Attempt to evaluate negative power of zero.
- Function: ^
Failed to evaluate temporary symbolic derivative variable.
- Variable: mod1.mf.murzz@VDN$mod1.curlAz
- Defined as: (dmod1.mat2.def.MUR_dx1((sqrt((((mod1.mf.By^2)+(mod1.mf.Bx^2))+(mod1.mf.Bz^2)))/unit_T_cf))*(((2*mod1.mf.Bz)*(((((mod1.mf.By^2)+(mod1.mf.Bx^2))+(mod1.mf.Bz^2))^-0.5)*0.5))*(1/unit_T_cf)))
Failed to evaluate temporary symbolic derivative variable.
- Variable: mod1.mf.murinvzz@VDN$mod1.curlAz
- Defined as: (((dmod1.mat2.def.MUR_dx1((sqrt((((mod1.mf.By^2)+(mod1.mf.Bx^2))+(mod1.mf.Bz^2)))/unit_T_cf))*(((2*mod1.mf.Bz)*(((((mod1.mf.By^2)+(mod1.mf.Bx^2))+(mod1.mf.Bz^2))^-0.5)*0.5))*(1/unit_T_cf))))*((-1)/(mod1.mf.murzz^2)))
Failed to evaluate temporary symbolic derivative variable.
- Variable: mod1.mf.Hz@VDN$mod1.curlAz
- Defined as: (((((((dmod1.mat2.def.MUR_dx1((sqrt((((mod1.mf.By^2)+(mod1.mf.Bx^2))+(mod1.mf.Bz^2)))/unit_T_cf))*(((2*mod1.mf.Bz)*(((((mod1.mf.By^2)+(mod1.mf.Bx^2))+(mod1.mf.Bz^2))^-0.5)*0.5))*(1/unit_T_cf))))*((-1)/(mod1.mf.murzz^2))))*mod1.mf.Bz)+mod1.mf.murinvzz)*(1/mu0_const))
Failed to evaluate expression.
- Expression: d(d((-mod1.mf.Hx*test(mod1.curlAx)-mod1.mf.Hy*test(mod1.curlAy)-mod1.mf.Hz*test(mod1.curlAz)+mod1.mf.Jx*test(mod1.Ax)+mod1.mf.Jy*test(mod1.Ay)+mod1.mf.Jz*test(mod1.Az))*(dvol),{test@3}),mod1.curlAz)