Partial differential algebraic equation
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In mathematics a partial differential algebraic equation (PDAE) set is an incomplete system of partial differential equations that is closed with a set of algebraic equations.
Definition
Summarize
Perspective
A general PDAE is defined as:
where:
- F is a set of arbitrary functions;
- x is a set of independent variables;
- y is a set of dependent variables for which partial derivatives are defined; and
- z is a set of dependent variables for which no partial derivatives are defined.
The relationship between a PDAE and a partial differential equation (PDE) is analogous to the relationship between an ordinary differential equation (ODE) and a differential algebraic equation (DAE).
PDAEs of this general form are challenging to solve. Simplified forms are studied in more detail in the literature.[1][2][3] Even as recently as 2000, the term "PDAE" has been handled as unfamiliar by those in related fields.[4]
Solution methods
Semi-discretization is a common method for solving PDAEs whose independent variables are those of time and space, and has been used for decades.[5][6] This method involves removing the spatial variables using a discretization method, such as the finite volume method, and incorporating the resulting linear equations as part of the algebraic relations. This reduces the system to a DAE, for which conventional solution methods can be employed.
References
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