Hi Ruth - perfect solution :-)
Physical Surface("fluid") = {ps1,ps2,ps3};
> You can just create a new physical with the 3 of them together.
>
> The original individual ones:
> Physical Surface("wake") = {ps1};
> Physical Surface("fluid") = {ps2};
> Physical Surface("pmlxy") = {ps3};
>
> and the one containing the three of them:
> Physical Surface("wake+fluid+pmlxy") = {ps1,ps2,ps3};
many thanks!
Nigel
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