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Errors when running study - Double Pipe HX
Posted 4 mag 2020, 22:15 GMT-4 Structural & Acoustics, Fluid & Heat, Heat Transfer & Phase Change Version 5.4 0 Replies
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Hi all. I'm very new to COMSOL, and tried to model this file off of one of the included COMSOL modules. I'm trying to solve a double pipe heat exchanger problem, which worked fine with the module until I used steam as the fluid in the inner pipe, then I began to get a lot of errors.
After that, I made my own file, copying the module but only including what seemed absolutely necessary for a temperature vs length study, yet I receive the same errors when I try to use steam in the inner pipe.
Can anyone help?
Here are the errors:
- Feature: Stationary Solver 2 (sol1/s2) Division by zero.
- Function: / Failed to evaluate variable.
- Variable: comp1.nitf2.vhNS_lin Failed to evaluate expression.
- Expression: nojac((1.4142135623730951455^(1-shapeorder(comp1.u2)))*max(comp1.nitf2.vhNS_lin-comp1.nitf2.vhNS_quad,0)) Failed to evaluate variable.
- Variable: comp1.nitf2.vhNS Failed to evaluate temporary symbolic derivative variable.
- Variable: comp1.nitf2.crosswindnitf@VDN${test@114} Failed to evaluate expression.
- Expression: (((((-(comp1.spf2.gijzr((comp1.nitf2.vhNS+comp1.nitf2.vhNS_prime)(comp1.nitf2.rhocomp1.w2r))))-(comp1.spf2.gijzz((comp1.nitf2.vhNS+comp1.nitf2.vhNS_prime)(comp1.nitf2.rhocomp1.w2z))))2)pi)r)dvol_spatial Failed to evaluate Jacobian of expression.
- Expression: (2comp1.nitf2.crosswindnitfpir)(dvol_spatial)
Attachments:
Hello N. Stevens
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