1. A method of characterizing graphical representation of numerical simulation results comprising: initially creating, by a user, a training database in a computer system by including a plurality of graphical representations of respective simulation results obtained from a plurality of numerical simulations of a product under a design condition; associating, by said user or another user, a textual description with each graphical representation in the computer system, the textual description comprising a pertinent feature related to the numerical simulations; calculating a quality index for said each graphical representation with respect to the associated textual description by one of at least one application module installed in the computer system using an autocorrelation technique of correlating the graphical representations with one another; characterizing, by said one or another of the at least one application module, a new graphical representation obtained in each new numerical simulation with one of the textual descriptions and a corresponding confidence score by comparing the new graphical representation to all of the graphical representations in the training database, the confidence score indicating a level of confidence with regards to said one of the textual descriptions; and updating the training database as a result of the new graphical representation according to predefined training database update criteria.