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Advanced Finite Element Simulation with MSC Marc: by Zia Javanbakht, Andreas Öchsner

By Zia Javanbakht, Andreas Öchsner

This booklet bargains an in-depth perception into the general-purpose finite point application MSC Marc, that's disbursed by means of MSC software program company. it's a really expert application for nonlinear difficulties (implicit solver) that is universal in academia and undefined. the first objective of this e-book is to supply a finished advent to a distinct characteristic of this software program: the consumer can write user-subroutines within the programming language Fortran, that's the language of all classical finite point programs. This subroutine function permits the consumer to exchange sure modules of the center code and to enforce new good points equivalent to constitutive legislation or new components. hence, the performance of industrial codes (‘black box’) can simply be prolonged through linking person written code to the most middle of this system. this selection permits to use a advertisement software program package deal with the flexibleness of a ‘semi-open’ code.

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True Block Pseudo-code False A? AND. B? IF A and B THEN TRUE block ELSE False Block END IF True Block False False Block (b) Demonstrated using a single IF construct Fig. AND. logic relational expression 1 I F ( aReal . EQ . 1 . 0 ) THEN This code tests if the variable aReal is equal to one. However, it is better to be replaced by the following: 1 I F ( ABS ( aReal − 1 . 0 ) . LT . 0 . 2 CASE Construct The IF construct is good enough to test several conditions. However, as the number of conditions increases, the nested IF construct might be rather confusing.

Every structure has only one entry and one exit point; attaching to other structures is only done by these points. Therefore, jumping from one point of the code to another one by means of statements such as GOTO is prohibited. Also sudden jumps out of a loop and jumps into a loop from outside are prohibited. • In a loop structure, the control of the program goes back to the decision symbol after executing the loop block. However, in a selection structure one of the two paths is selected. Then, both sides are joined together, not to the decision symbol, and the program continues.

Fig. 2 Iterative stages of programming. 1 Planning the Logic In programming, there exists a task/problem at hand, a goal which will be achieved by a series of steps of calculations and/or actions. e. a sequence of small steps which will finally produce the solution of the problem. In computer science, the word ‘algorithm’ is used in a more specific way than merely a method: “…a precise method usable by a computer for the solution of a problem” [15]. This definition necessitates that finite steps of any algorithm to be ordered, well-defined, precise and unambiguous resulting in a clear computational procedure.

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