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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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Syntax Error (COMSOL Multiphysics 4.4)

Posted 2023年1月11日 GMT+8 03:08 Chemical Reaction Engineering, Studies & Solvers Version 4.4 1 Reply

Maryam Ahmadi
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I'm trying to model 3 reactions using "Transfer of diluted species". I checked my reaction componants and they don't seem to have any syntax error.

This is the error message:

Syntax error in expression.

Expression: 0+(Kw1-Kw2×cH×cOH+kad×cHX-kai×cH×cX)

Subexpression: -kai×cH×cX

Position: 26

Error in multiphysics compilation

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1 Reply Last Post 2023年1月11日 GMT+8 04:45
Robert Koslover Certified Consultant
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Posted: 1 year ago 2023年1月11日 GMT+8 04:45
Updated: 1 year ago 2023年1月11日 GMT+8 04:50

Note: I looked at your file using Comsol 6.1, so your experience may be different. And I'm not sure if my note here will take care of all of the issues, but your many user-entered expressions seem to have hidden characters adjoining at least many of your minus signs and perhaps elsewhere. If you select any of your expressions and move along with them with the arrow keys (left or right), you can see an extra step (i.e., you have to hit an arrow key twice, yet the cursor moves only one character!) happen there, adjacent to at least some of your minus signs. I'm guessing you cut & pasted in these equations from some kind of document file that had hidden characters encoded into it, which you didn't notice. I encourage you to go through your .mph file and carefully check all your user-entered or pasted expressions for such hidden characters and get rid of them! Good luck.

-------------------
Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
Note: I looked at your file using Comsol 6.1, so your experience may be different. And I'm not sure if my note here will take care of all of the issues, but your many user-entered expressions seem to have *hidden characters* adjoining at least many of your minus signs and perhaps elsewhere. If you select any of your expressions and move along with them with the arrow keys (left or right), you can see an extra step (i.e., you have to hit an arrow key twice, yet the cursor moves only one character!) happen there, adjacent to at least some of your minus signs. I'm guessing you cut & pasted in these equations from some kind of document file that had hidden characters encoded into it, which you didn't notice. I encourage you to go through your .mph file and carefully check *all* your user-entered or pasted expressions for such hidden characters and get rid of them! Good luck.

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