跨音速数值计算迭代过程的图形追踪与分析

跨音速数值计算调试过程的图形追踪方法,采用标准 FORTRAN 77所提供的读写方法,用DATA语句给数组元素赋文字型初值,编程在主程序中插入。运行中随机打印中间数据结果的曲线形式,因而减少了人工绘制草图的工作量。由于不必脱机,大大提高了程序的调试速度。在 IBM-4341机上给出 NACA0012翼型二元绕流若干状态下的中间数据结果及追踪图形。分析结果表明,尽管打印图形的精度受到文本方式的限制,但作为一种直观分析的工具,满足了实际排错的需要。最后给出算编例程所需的清单。

THE CRAPHIC TRACING AND ANALYSIS FOR DEBUGGING PROGRAMME IN ITERATION OF TRANSONIC NUMERICAL CALCULATION

An approach for graphic debugging of iteration of tran-sonic numerical calculating has been introduced,which adopts themodel of read/write offered by standard FORTRAN 77,completed and inserted it in the main programme.A character constants as an initialvalue assigned to the elements of array by DATA statement.In thisway,the curve pattern of the data in operation has been printedimmediately,as an accompaniment of the results obtained.Here hasalso given some typical debugging cases calculated on IBM/4341,andthe graphics were compared with the data obtained which there weresome careless errors.Practice of calculating showed that the tracing graphic offered aconvenient method to debug the error occured in calculation,whichneeds a manual labour to do it before,and improved the speed ofdebugging programme,because it needn't to be take off the computer.Finally a list of the programme for this example is given.