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Through a special formulation, a system of nonlinear partial differential equations was solved alternately and explicitly in time without linearizing the nonlinearity. <jats:italic>Coupled<\/jats:italic> compact schemes of sixth order accuracy in space were developed to obtain numerical solutions. Within <jats:italic>couple<\/jats:italic> compact schemes, variables and their first and second derivatives were solved altogether. The sixth order accuracy in space is achieved with a memory-saving arrangement of state variables so that the linear system is banded instead of blocked. This facilitates solving very large systems. The efficiency, simplicity, and accuracy make this coupled compact method viable as variational and weighted residual methods. Results were compared with exact solutions which were obtained via devised forcing terms. Error analyses were carried out, and the sixth order convergence in space and second order convergence in time were demonstrated. Long time integration was also studied to show stability and error convergence rates.<\/jats:p>","DOI":"10.1155\/2013\/432192","type":"journal-article","created":{"date-parts":[[2013,12,4]],"date-time":"2013-12-04T22:55:06Z","timestamp":1386197706000},"page":"1-10","source":"Crossref","is-referenced-by-count":5,"title":["A Sixth Order Accuracy Solution to a System of Nonlinear Differential Equations with Coupled Compact Method"],"prefix":"10.1155","volume":"2013","author":[{"given":"Don","family":"Liu","sequence":"first","affiliation":[{"name":"Mathematics and Statistics, Louisiana Tech University, Ruston, LA 71272, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Qin","family":"Chen","sequence":"additional","affiliation":[{"name":"Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, 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