D3Q27 lattice

[sharkskinz3]

Hello OpenLB,

I have been trying to compile one of the examples provided with the download by swapping out the provided D3Q19 lattice with D3Q27. I thought this would be a simple matter of replacing the definition at the top of the application source, i.e.

#define DESCRIPTOR D3Q27<>

and making a clean build, but this generates a lot of errors at the link stage (specifically undefined references).

Can anyone help?

[mathias]

Dear sharkskinz3,

which example was it? Can you also post the error message? Did you compile in “generic” mode (cf. user guide)?

Best
Mathias

[sharkskinz3]

Hi Mathias,

thank you for your reply.

I am compiling the laminar cylinder3d example.
The errors I get (and there are a lot of them) are at the link stage, for example:

cylinder3d.cpp:(.text.startup+0x74e): undefined reference to `olb::sOnLatticeBoundaryCondition3D<double, olb::descriptors::D3Q27<> >::~sOnLatticeBoundaryCondition3D()’

I am not sure that I am compiling in generic mode. During compilation, the flag -DOLB_PRECOMPILED is passed, so I assume I am using pre-compiled libraries.

I could not find a reference in the user guide for compiling in generic mode; is this a command line switch, or do I need to modify one of the make files (global.mk?)?

Thank you for your help.

sk3

[mathias]

Yes you need to change the config.mk

BUILDTYPE := precompiled
#BUILDTYPE := generic

to

#BUILDTYPE := precompiled
BUILDTYPE := generic

Then, you need to recompile the entiere code by

make cleanbuild
make

There are section in the user guide. Seaech for “precompiled”.

Best
Mathias

[sharkskinz3]

Perfect. Thank you Mathias!

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