Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.
Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Problems when using external matlab functions
Posted 2 ago 2011, 06:48 GMT-4 Version 4.2 0 Replies
Please login with a confirmed email address before reporting spam
I need help on problems when using external matlab functions in comsol 4.2.
My model uses Laminar Flow and ALE module.
I wish to calculate curvature of one boundary in MATLAB, and returns the result to COMSOL. However, when I just defined the matlab function in global definitions, the error messages appeared:
Syntax error in expression.
- Expression: nojac(0.5*min(mod1.spf.ck*sqrt((0.5*mod1.spf.res_p/(sqrt(emetric_spatial(1[1],0[1])+emetric_spatial(0[1],1[1]))*mod1.spf.rho))^2+(mod1.spf.tau_m*mod1.spf.res_u)^2+(mod1.spf.tau_m*mod1.spf.res_v)^2+(mod1.spf.tau_m*mod1.spf.res_w)^2),2*sqrt(emetric_spatial(mod1.u-d(r,TIME),mod1.w-d(z,TIME))/(emetric_spatial(1[1],0[1])+emetric_spatial(0[1],1[1])))*pi*r)*min(sqrt((d(mod1.u-d(r,TIME),r)^2+d(mod1.u-d(r,TIME),z)^2+if(abs(r)<0.0010*h,d(mod1.u-d(r,TIME),r),(mod1.u-d(r,TIME))/r)^2+d(mod1.w-d(z,TIME),r)^2+d(mod1.w-d(z,TIME),z)^2+sqrt(eps))/((d(mod1.u-d(r,TIME),r)*mod1.spf.gijrr+d(mod1.u-d(r,TIME),z)*mod1.spf.gijzr)*d(mod1.u-d(r,TIME),r)+(d(mod1.u-d(r,TIME),r)*mod1.spf.gijrz+d(mod1.u-d(r,TIME),z)*mod1.spf.gijzz)*d(mod1.u-d(r,TIME),z)+(d(mod1.w-d(z,TIME),r)*mod1.spf.gijrr+d(mod1.w-d(z,TIME),z)*mod1.spf.gijzr)*d(mod1.w-d(z,TIME),r)+(d(mod1.w-d(z,TIME),r)*mod1.spf.gijrz+d(mod1.w-d(z,TIME),z)*mod1.spf.gijzz)*d(mod1.w-d(z,TIME),z)+sqrt(eps*mod1.spf.gijij))),mod1.spf.rho*sqrt(emetric_spatial(mod1.u-d(r,TIME),mod1.w-d(z,TIME))/(emetric_spatial(1[1],0[1])+emetric_spatial(0[1],1[1])))/(12*mod1.spf.mu)))*mod1.spf.rho*(-mod1.spf.gijrr*(test(mod1.pr)*mod1.spf.betaT*mod1.pr+test(mod1.ur)*mod1.ur+test(mod1.wr)*mod1.wr)-mod1.spf.gijrz*(test(mod1.pr)*mod1.spf.betaT*mod1.pz+test(mod1.ur)*mod1.uz+test(mod1.wr)*mod1.wz)-mod1.spf.gijzr*(test(mod1.pz)*mod1.spf.betaT*mod1.pr+test(mod1.uz)*mod1.ur+test(mod1.wz)*mod1.wr)-mod1.spf.gijzz*(test(mod1.pz)*mod1.spf.betaT*mod1.pz+test(mod1.uz)*mod1.uz+test(mod1.wz)*mod1.wz))
As long as I disable the definition, my comsol program runs just fine.
How to solve the problem? It is wired to me.
Thank you!
Hello Yuanyuan Shen
Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.
If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.