The problem persists with the latest LTS version of Ubuntu.
However, the fault disappeared when I used the following codes in accordance to Elmer Models Manual
But looking at the source code of FlowSolve.F90 - lines 825-847, there is no keyword Porous Resistance and thus it can be concluded that this will yield Pwrk as null matrix , and effectively drag = 0 (that is no calculation of the effects of porous resistivity). So, either Porous Resistivity should be entered as real array Porous Resistivity (i,j) or Porous Resistivity i, i=1,2,3 must be entered as real number in the solver input file. This again renders the same question which you put at the beginning. This can just be a notification to Elmer Team to edit the list of keywords in Elmer Models Manual.
Code: Select all
... Porous Media = Logical True Porous Resistance = Real 1.02345 ...