By Zia Javanbakht, Andreas Öchsner
This publication bargains an in-depth perception into the general-purpose finite aspect software MSC Marc, that is allotted by way of MSC software program company. it's a really expert application for nonlinear difficulties (implicit solver) that's universal in academia and undefined. the first aim of this ebook is to supply a accomplished advent to a different function of this software program: the consumer can write user-subroutines within the programming language Fortran, that is the language of all classical finite aspect programs. This subroutine function permits the consumer to exchange definite modules of the center code and to enforce new beneficial properties resembling constitutive legislation or new components. therefore, the performance of industrial codes (‘black box’) can simply be prolonged by way of linking person written code to the most center of this system. this option permits to exploit a advertisement software program package deal with the flexibleness of a ‘semi-open’ code.
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Additional info for Advanced Finite Element Simulation with MSC Marc: Application of User Subroutines
The equivalent CASE construct is as the following: 1 2 3 4 5 6 7 8 SELECT CASE ( I n t ( Sign ( d e l t a , d e l t a ) ) ) CASE ( + 1 : ) WRITE ( ∗ , ∗ ) ’ Two d i s t i n c t r o o t s ’ CASE ( 0 ) WRITE ( ∗ , ∗ ) ’ One d o u b l e r o o t ’ CASE ( : − 1 ) WRITE ( ∗ , ∗ ) ’ No r e a l r o o t s ’ END SELECT Considering this example, it can be seen that sometimes using a CASE structure is not in favor of simplicity. This example can be modified using a DEFAULT case, to be less specific and just state if any roots exist or not: 1 2 3 4 5 6 SELECT CASE ( I n t ( Sign ( d e l t a , d e l t a ) ) ) CASE ( 0 : ) WRITE ( ∗ , ∗ ) ’ Real Root ( s ) ’ CASE DEFAULT WRITE ( ∗ , ∗ ) ’ No r e a l r o o t s ’ END SELECT More complicated case recognitions can be developed using nested CASE constructs with another one or even with an IF construct to take advantage of its capabilities.
Referencing can be done for both functions and subroutines; called function reference and subroutine reference, respectively. Referencing to a subroutine is done using a Call statement and to a function is done when the function is used in an expression. User-defined programming units can be accessed with proper referencing. In contrast to the user defined procedures, there are procedures provided by Fortran itself which are called intrinsically defined procedures or intrinsic procedures. g. Sign (), Sqrt (), Abs () etc.
As an example, consider again the example of finding the number of the roots for a quadratic equation based on its discriminant (delta). This was carried out earlier using a nested IF structure. Because delta is a REAL type variable and not a discrete value, it cannot be used directly as a case index. However, the sign of delta is a discrete value and thus, it can be used. Two intrinsic functions are needed: Int (A) which truncates the real value of A and returns an integer; Sign (A, B) which returns +|A| if B is positive and −|A| otherwise.
Advanced Finite Element Simulation with MSC Marc: Application of User Subroutines by Zia Javanbakht, Andreas Öchsner