Central moments

This MR implements the central moment collision operator. Furthermore, some clean-up in the derivation pipeline is provided.

• derivation of the central moments from the continuous equilibrium
• derivation of the central moments via shift matrix for the discrete equilibrium
• implementation of a central moment class
• finish implementation of the collision
• provide test cases for the operator
• add documentation

added feature proposal label

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• b8c7f46b - Clean up

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• 3e2e0276 - Implemented collision

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• 6aad9f62 - moved statistial quantatiy symbol

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added 10 commits

• 6aad9f62...06c4bb77 - 8 commits from branch pycodegen:master
• e6d17e69 - Added central moment force model
• 1c57a43a - Merge branch 'master' of i10git.cs.fau.de:pycodegen/lbmpy into CentralMoments

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• 1c57a43a...a6e35ca6 - 7 commits from branch pycodegen:master
• b7763952 - resolved merge confilct

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• 5bd323c6 - Update

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• 729e8cb4 - Implemented contact angle treatment

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• 729e8cb4...cf17a9b9 - 12 commits from branch pycodegen:master
• 74d189a3 - Merge branch 'master' of i10git.cs.fau.de:pycodegen/lbmpy into CentralMoments
• 82e98e3c - Finished implementation of central moments

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added 1 commit

• b8962fe5 - Added phase field tutorial

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marked the checklist item finish implementation of the collision as completed

marked the checklist item provide test cases for the operator as completed

marked the checklist item add documentation as completed

marked this merge request as ready

requested review from @kuron and removed review request for @schottenhamml

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• b45009ee - Fix doc issues

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• ec02d6f4 - Update 10_tutorial_conservative_allen_cahn_two_phase.ipynb

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• b99e7148 - Update 10_tutorial_conservative_allen_cahn_two_phase.ipynb

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added 4 commits

• b99e7148...9fcdd0d9 - 2 commits from branch pycodegen:master
• 4d57c922 - Merge branch 'master' of i10git.cs.fau.de:pycodegen/lbmpy into CentralMoments
• 668ecb85 - Merge branch 'CentralMoments' of i10git.cs.fau.de:holzer/lbmpy into CentralMoments

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