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Dear nek5000 team,
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<div>Could you help me with the 2 questions below? Thank you very much !</div>
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<div>1)</div>
<div>Concerning the routine “axhelm” in hmholtz.f. If I am right, one possibility of this routine can be the discretisation of the diffusion operator. However it is not clear to me if axhelm performs:</div>
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<div>a) vdiff x Laplacian(phi)</div>
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<div>or </div>
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<div>b) grad ( vdiff x grad (phi) )</div>
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<div>phi being the variable solved for (T or PS for example).</div>
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<div>So, is it actually a) or b) ?</div>
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<div>2) </div>
<div>In the routine wlaplacian in navier1.f, I am not sure to understand the consequence of the line:</div>
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<div>call sub2 (out,wrk,ntot)</div>
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<div>after the lines:</div>
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<div>call bcneusc(out,1)</div>
<div>call axhelm(wrk,a,diff,h2,imesh,1)</div>
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<div>If I am right, this will change the sign in front of the diffusion operator, right? </div>
<div>Because in makeq.f, I am not sure that the line</div>
<div>call add2(bq(1,1,1,1,ifield-1),w1,ntot)</div>
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<div>will actually assemble the RHS of the transport equation : - (vtrans) x U grad (phi) + grad ( vdiff x grad (phi) )</div>
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<div>Thank you for your help !</div>
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<div>Best regards,</div>
<div>Emmanuel</div>
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