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If assigned a preconditioner to A11 with this cmd options:
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<div class=""><span style="font-family: STSongti-SC-Regular;" class=""> -fieldsplit_0_ksp_type gmres -fieldsplit_0_pc_type ilu -fieldsplit_1_ksp_type gmres
<b class="">-fieldsplit_1_pc_type ilu</b></span></div>
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<div class=""><font face="STSongti-SC-Regular" class=""><b class="">Then I got this error: </b></font></div>
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</b></font></div>
<div class=""><font face="STSongti-SC-Regular" class=""><b class="">"Could not locate a solver type for factorization type ILU and matrix type schurcomplement"</b></font></div>
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</b></font></div>
<div class=""><font face="STSongti-SC-Regular" class=""><b class="">How could I specify a preconditioner for A11?</b></font></div>
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</b></font></div>
<div class=""><font face="STSongti-SC-Regular" class=""><b class="">BR,</b></font></div>
<div class=""><font face="STSongti-SC-Regular" class=""><b class="">Xiaofeng</b></font></div>
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</b></font>
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<blockquote type="cite" class="">
<div class="">On Sep 26, 2022, at 11:02, 晓峰 何 <<a href="mailto:tlanyan@hotmail.com" class="">tlanyan@hotmail.com</a>> wrote:</div>
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gmres -fieldsplit_0_pc_type ilu -fieldsplit_1_ksp_type gmres -fieldsplit_1_pc_type none</span></div>
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