How to stop iteration process from UDF
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Sometimes, users want to stop iteration process according to some criteria that are calculated in a UDF. But FLUENT can only stop the iteration process after a fixed number of iterations or when residual is reached. Solution is to perform in a scheme loop 1 iteration, until some rp-variable is changed. The scheme-side could look like this: ; ; make it possible that a UDF stops the iterations ; (if (not (rp-var-object 'stop))(rp-var-define 'stop #f 'bool #f)) (define (my-iter max-iter) (do ((i 0 (+ i 1)) ) ((or (> i max-iter) (%rpgetvar 'stop)) ) (display i) (newline) (iterate 1) ) ) The UDF side looks like this: #include "udf.h" double bc=1.0,dbc=1.0; DEFINE_PROFILE(cathode,ft,eqn) { face_t f; dbc *= 0.5; bc += dbc; Message("dbc=%gn",dbc); if(dbc<0.0001) RP_Set_Boolean("stop",1); begin_f_loop(f,ft) { F_PROFILE(f,ft,eqn) = bc; } end_f_loop(f,ft) } You would hook the UDF to some boundary condition, and start the iteration from the TUI with (my-iter 2000) This solution should also apply to 6.2.16. In this version there is still no other way to stop iterating from a UDF (as far as I know). |
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