A Parameterized Splitting Preconditioner for Generalized Saddle Point Problems

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr class="thead"><td align="left">  Grid </td><td align="center"><span style="width: 9.7749996px;"><svg height="7.9499998" id="M112" style="vertical-align:-0.1638pt" version="1.1" viewbox="0 0 9.7749996 7.9499998" width="9.7749996" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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</svg></span></td><td align="center"> its </td><td align="center"> LU time </td><td align="center"> its time </td><td align="center"> Total time </td></tr><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr><td align="left"><span style="width: 50.299999px;"><svg height="11.225" id="M113" style="vertical-align:-0.1638pt" version="1.1" viewbox="0 0 50.299999 11.225" width="50.299999" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,10.963)"><path d="M384 0h-275v27q67 5 81.5 18.5t14.5 68.5v385q0 38 -7.5 47.5t-40.5 10.5l-48 2v24q85 15 178 52v-521q0 -55 14.5 -68.5t82.5 -18.5v-27z" id="x31"></path></g><g transform="matrix(.017,-0,0,-.017,8.222,10.963)"><path d="M137 343l67 33q37 17 63 17q79 0 129.5 -53t50.5 -131q0 -92 -58 -156.5t-147 -64.5t-147 68t-58 182q0 63 17 119t43 95.5t61.5 72t69 52t67.5 31.5q62 22 128 33l6 -32q-56 -11 -108 -35q-149 -71 -184 -231zM227 337q-47 0 -95 -27q-6 -23 -6 -70q0 -93 36 -155.5
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</svg></span></td><td align="center"> 0.0001</td><td align="center"> 2 </td><td align="center">0.0481</td><td align="center"> 0.0206</td><td align="center"> 0.0687</td></tr><tr><td align="left"><span style="width: 50.299999px;"><svg height="11.125" id="M114" style="vertical-align:-0.1638pt" version="1.1" viewbox="0 0 50.299999 11.125" width="50.299999" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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</svg></span></td><td align="center"> 0.0001</td><td align="center"> 3 </td><td align="center">0.4661</td><td align="center">0.0585</td><td align="center"> 0.5246</td></tr><tr><td align="left"><span style="width: 50.299999px;"><svg height="11.225" id="M115" style="vertical-align:-0.1638pt" version="1.1" viewbox="0 0 50.299999 11.225" width="50.299999" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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</svg></span></td><td align="center"> 0.0001</td><td align="center"> 3</td><td align="center">6.6240 </td><td align="center"> 0.2728</td><td align="center"> 6.8969</td></tr><tr><td align="left"><span style="width: 66.612503px;"><svg height="11.125" id="M116" style="vertical-align:-0.1638pt" version="1.1" viewbox="0 0 66.612503 11.125" width="66.612503" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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</svg></span></td><td align="center"> 0.0001</td><td align="center"> 4 </td><td align="center">177.3130</td><td align="center"> 2.9814</td><td align="center">180.2944</td></tr><tr class="table-tr"><td colspan="6"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Preconditioned GMRES(20) on steady Oseen problems with different grid sizes (uniform grids), viscosity <svg height="11.125" id="M111" style="vertical-align:-0.1638pt" version="1.1" viewbox="0 0 64.224998 11.125" width="64.224998" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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</svg>.

Journal of Applied Mathematics

tab4

Table 4

Table 4: A Parameterized Splitting Preconditioner for Generalized Saddle Point Problems 