Turbulence in a transient channel flow with a wall of pyramid roughness

Acknowledgements The authors acknowledge funding from the UK Engineering and Physical Science Research Council (EP/G068925/1 and EP/G069441/1). We are grateful to Professor P. Orlandi for his advice on the numerical methods. This work made use of the facilities of the N8 HPC, provided and funded by the N8 consortium and EPSRC (grant no. EP/K000225/1), as well as the UK National Supercomputer ARCHER sponsored by EPSRC through the UK Turbulence Consortium (UKTC) (grant no. EP/L000261/1).

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