By Pierre Lelong
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The bandwidth of the matrix is affected Finite Element Analysis for Heat Transfer 40 by the method of numbering of the nodes. In general, the smaller the bandwidth, the greater the computational efficiency of the solution process. 109) From the boundary conditions, we already kriow that and, Tg = TlO = 100 Therefore, the equations corresponding to Tt , T2, T4, T6 and Ts are to be replaced by Tt = 0, T2 = 0, T4 = 0, T6 = 0 and Ts = 0 and the equations corresponding to Tg and TlO are to be replaced by Tg = 100 and Tto = 100.
The functions =0 defining three sides of the master element are given by ", = 0, 1 and = O. 110) which has a unit value at node 1 and zero value at nodes 2, 3. 111) which has a unit value at node 2 and zero value at nodes 3, 1. 99). 81), it has been necessary to establish the shape function derivatives with respect to the (x,y) coordinates. i. i. 117) 8", 81/ 81/ This mapping technique is specially useful for high order elements. 8: 4,8 and 9 node elements which are quadratic in (~, "I). 7 shows the mapping from a general quadrilateral to a square.
If we consider a single element of length h with one end at a fixed temperature of zero (at x = 0). The temperature in the rest of the element may then be defined by 55 Temporal Discretisation for Heat Conduction means of a single shape function I multiplied by the temperature at the free end. 28) This result may be applied to general 2-D or 3-D problems if the minimum element size (h min ) in the mesh is used which corresponds to the maximum eigenvalue. It is seen from these results that the critical time step for explicit schemes (at which instability impends) depends upon the square of the element size.