PDE Interface Variables
The following list shows symbolic expressions for quantities appearing in the definition of PDEs and the corresponding variable names, which can be used in PDE coefficients and are available for results evaluation and visualization.
ui
ui
uixj
The derivative of the solution variable ui with respect to the spatial coordinate xj, for example, uy
uiTxj
The xj component of the gradient of ui projected onto a boundary or edge, for example, uTy
uixjxk
The second derivative of the solution variable ui with respect to the spatial coordinates xj and xk, for example, uxx, uxy
uit
uitt
uixjt
The mixed derivative of the solution variable ui with respect to time and the spatial coordinate xj