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Spero, your code is precisely correct. You must specifically name the data "h" in your code for it to work. AJB A.J. Baker, PhD, PE Professor Emeritus Director, UT CFD Laboratory, http://cfdlab.utk.edu University of Tennessee Knoxville TN 37996 2030 USA Cell: 865.207.1537 ________________________________________ From: me452w [[log in to unmask]] on behalf of Peters, Spero Michael Sent: Wednesday, April 13, 2011 4:17 PM To: [log in to unmask] Subject: Lab 12 TWS Conversion Dr. Baker, I'm working through Lab 12, and I'm not quite sure how to properly convert the GWS code to a TWS, unfortunately it seems that the video lecture labled as dealing with Lab 12 actually has you going over Lab 13. I took the liberty of sending this through the listserv as your answer can benefit the whole class Based on pseudo code in the problem statement, I put together this code to add onto the 'Equations for Set 0' where h is h = (right_X - left_X)/mesh where mesh is 10,20,40,80 Orginal GWS code+... +asres2D((h^2)*Pe/12,[ ],[ ],-1,'B211L',q)... +asres2D((h^2)*Pe/12,[ ],[ ],-1,'B212L',q)... +asres2D((h^2)*Pe/12,[ ],[ ],-1,'B221L',q)... +asres2D((h^2)*Pe/12,[ ],[ ],-1,'B222L',q); I'm not sure how I miss-implemented the TWS solution, other than perhaps not adding in something in the jacobian portion? Thank you Spero Peters