A family of splitting methods for the time integration of evolutionary Adve
ction Diffusion Rea
ction Partial Differential Equations (PDEs) semi-dis
cretized in spa
ce by Finite Differen
ces is obtained. The splitting is performed in the Ja
cobian matrix by using the Approximate Matrix Fa
ctorization (AMF) and by
considering up to three inexa
ct Newton Iterations applied to the two-stage Radau IIA method along with a very simple predi
ctor. The overall pro
cess allows to redu
ce the storage and the algebrai
c costs involved in the numeri
cal solution of the multidimensional linear systems to the level of 1D-dimensional linear systems with small bandwidths.
Some specific AMF-Radau methods are constructed after studying the expression for the local error in semi-linear equations, and their linear stability properties are widely studied. The wedge of stability of the methods depends on the number of splittings used for the Jacobian matrix of the spatial semidiscretized ODEs, class="mathmlsrc">ce" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0168927415001464&_mathId=si1.gif&_user=111111111&_pii=S0168927415001464&_rdoc=1&_issn=01689274&md5=0ae734e82f0f6cfb76a0e4fd57e35682">class="imgLazyJSB inlineImage" height="20" width="92" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0168927415001464-si1.gif">cript>cal-align:bottom" width="92" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0168927415001464-si1.gif">cript>class="mathContainer hidden">class="mathCode">, where h stands for the spatial grid resolution. A-stability is proven for the cases class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0168927415001464&_mathId=si162.gif&_user=111111111&_pii=S0168927415001464&_rdoc=1&_issn=01689274&md5=7a0bc686fe3cfd2fa2cc5af9b96d84dd" title="Click to view the MathML source">d=1,2class="mathContainer hidden">class="mathCode">, and class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0168927415001464&_mathId=si232.gif&_user=111111111&_pii=S0168927415001464&_rdoc=1&_issn=01689274&md5=058a9cc66a9641f09a9624400ad614e4" title="Click to view the MathML source">A(0)class="mathContainer hidden">class="mathCode">-stability for any class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0168927415001464&_mathId=si233.gif&_user=111111111&_pii=S0168927415001464&_rdoc=1&_issn=01689274&md5=55cd97fb0cc1131658b42cfae2835f1c" title="Click to view the MathML source">d≥1class="mathContainer hidden">class="mathCode">.
Numerical experiments on a 3D semi-linear advection diffusion reaction test problem and a 2D-combustion model are presented. The experiments show that the methods compare well with standard classical methods in parabolic problems and can also be successfully used for advection dominated problems when some diffusion or stiff reactions are present. In the latter case the stability imposes restrictions on the number of splitting terms (d).