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From: mwang@watmath.UUCP (mwang)
Newsgroups: ont.events
Subject: UW EE & CS Seminar, Dr. Skelboe on "Multirate Integration Methods, Theory and Implementation"
Message-ID: <7689@watmath.UUCP>
Date: Tue, 8-May-84 14:00:28 EDT
Article-I.D.: watmath.7689
Posted: Tue May  8 14:00:28 1984
Date-Received: Wed, 9-May-84 02:04:47 EDT
Expires: Wed, 16-May-84 00:00:00 EDT
Organization: U of Waterloo, Ontario
Lines: 48


_U_N_I_V_E_R_S_I_T_Y _O_F _W_A_T_E_R_L_O_O

_D_e_p_a_r_t_m_e_n_t _o_f _C_o_m_p_u_t_e_r _S_c_i_e_n_c_e
_j_o_i_n_t_l_y _w_i_t_h
_D_e_p_a_r_t_m_e_n_t _o_f _E_l_e_c_t_r_i_c_a_l _E_n_g_i_n_e_e_r_i_n_g

Presents a Numerical Analysis Seminar on

Multirate Integration Methods, Theory and Implementation

with

Dr. Stig Skelboe
Institute of Datalog,
University of Copenhagen,
Copenhagen N, Denmark

DATE:                Monday, May 14 and Tuesday, May 15, 1984 at 3:30 PM

ROOM:              MC 6091A

ABSTRACT

In the simulation of many physical systems,  the  solu-
tion  components can be separated in two or more groups
with widely varying rate of change.  Classical discret-
ization  methods  use the same mesh for the discretiza-
tion of all parts of a system while  multirate  methods
adapt  the  mesh  for  each  sub-system  to the rate of
change of  the  variables  describing  that  particular
sub-system.

This paper presents multirate integration formulas  for
stiff  systems of ordinary differential equations.  The
multirate formulas are based on  backward  differentia-
tion  formulas,  and  the principles of an experimental
implementation are discussed.  The  absolute  stability
properties  are  analyzed using a 2x2 linear test equa-
tion system, and finally an  example  is  given  demon-
strating  the performance of the experimental implemen-
tation.

For further information please contact Prof. P.  Bryant
at ext. 3370.

                      May 8, 1984