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A lattice Boltzmann code for complex fluids

Results 9 ludwig issues
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Need a formal mechanism to allow the replacement of field values at solid points in output. cf. `io_replace_field_values()` Part of i/o, but has a dependency on `map_t`.

enhancement

The i/o code in `io_harness.[ch]` should be replaced by the new i/o mechanism in - [ ] `map.c` - [ ] `noise.c` This will allow `io_harness.[ch]` and associated code to...

shortcoming

Adapting the Lees-Edwards boundary condition (BC) method from the Ludwig codebase to operate on a GPU.

The attached input produces this error at the end of the run, though it seems to produce the desired output. Not sure whether it has consequences. [input.txt](https://github.com/ludwig-cf/ludwig/files/12217391/input.txt)

New potential for subgrid particles

Step 1 of temperature implementation. Added symmetric_aot.[ch] and respective keyword in free_energy.h Computation of stress is at very early stage and will need to be modified in the future.

Move the MPI stub tests to the unit test location to allow them to run with a standard MPI implementation for consistency check.

enhancement

The time has finally come to relax the one elastic constant approximation in the liquid crystal sector. This requires the cross derivative d_a d_b Q ("dab"). - [ ] update...

enhancement

A general machanism to record relevant free energy contributions to file on a per free energy basis is required.

enhancement