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Hello Everyone,

Kindly share your experience if you encountered similar problem.

I am using Comsol 3.5 with matlab and the following error is displayed while the same code works fine with Comsol 3.4. The problem is 2D- trasient with Navier-Stokes module.

Thanks,
Mranal



??? Java exception occurred:
Exception:
com.femlab.jni.FlNativeException: Failed to evaluate expression
Messages:
Failed to evaluate expression
- Expression:
d(d((((-2*eta_ns*ux+p)*test(ux)-eta_ns*(uy+vx)*test(uy)+gls_ns+shock_capt_ns)-(0))*(dvol_ale),{test@4}),xxi2)

Failed to evaluate symbolic derivative variable
- Variable: shock_capt_ns@VDN${test@4}@VDN$xxi2
- Defined as:
((((d(y,xi2))*uy)+(ux*((2*d(x,xi2)))))*((-nojac((min((gijgij_ns^-0.25),((U_ale_ns*rho_ns)/(48*eta_ns)))*(0.5*min((sqrt((((taum_ns*res_v_ns)^2)+((((tauc_ns*res_p_ns)/(nojac(sqrt((u2int_g1_ns/vol_g1_ns)))*nojac((rhoint_g1_ns/vol_g1_ns)))))^2+((taum_ns*res_u_ns))^2)))*ck_ns),U_ale_ns)))))*rho_ns))

Failed to evaluate expression
- Expression:
nojac((min((gijgij_ns^-0.25),((U_ale_ns*rho_ns)/(48*eta_ns)))*(0.5*min((sqrt((((taum_ns*res_v_ns)^2)+((((tauc_ns*res_p_ns)/(nojac(sqrt((u2int_g1_ns/vol_g1_ns)))*nojac((rhoint_g1_ns/vol_g1_ns)))))^2+((taum_ns*res_u_ns))^2)))*ck_ns),U_ale_ns))))

Sqrt of negative
- Function: sqrt

Stack trace:
at evaltree.cpp, row 866, ()
at evalnodes.cpp, row 1083, ()
at xevalutil.cpp, row 2659, ()
at evalfun_basic.cpp, row 237, ()
at com.femlab.solver.FlSolver.femTime(Native Method)
at com.femlab.solver.FemTime.run(Unknown Source)
at com.femlab.server.FlRunner.run(Unknown Source)
at com.femlab.server.q.run(Unknown Source)
at com.femlab.util.i.run(Unknown Source)
at com.femlab.util.aa.run(Unknown Source)

Error in ==> femsolver at 368
solobj.smartRunner(report, loopTime);

Error in ==> femtime at 120
varargout = femsolver(mfilename,'FemTime',varargin{:});

Error in ==> EK_sphere_particle_ALE_Rpt1 at 272
fem.sol=femtime(fem, ...