Surface Integral

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Author Message   Tai Wong (bandh) New member Username: bandh Post Number: 1 Registered: 09-2005 Posted on Friday, September 02, 2005 - 12:34 pm:    I am developing a model for air injection through a well into the ground. The surface integral I used is giving me zero flux - sintegral(integrand, named_boundary, named_layer) option. Will someone suggest a better option? The pde fie is attached (version 4.2.16). Thanks. surface integral B&H_3d_QS.pde (6.2 k)   Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 447 Registered: 06-2003 Posted on Friday, September 02, 2005 - 04:38 pm:    When I run your file on 4.2.16, the only report giving a zero result is the "(integrand, boundary, layer, region)" form. In that statement, you have specified evaluation in layer "screen" and region "well_screen". But that region is VOID in that layer, so the result of the evaluation is necessarily zero. Change the region of evaluation to 'domain', and you will get a non-zero value.