Data from numerical simulations of viscous fingering in fractured porous media. The folder structure of the dataset is given as follows: res_NAME_OF_FRACTURE_GEOMETRY/NAME_OF_VARIABLE/csv/DATA_FILES. The name of the DATA_FILES gives the values of the dimensionless parameters used in the simulation that generated the datafile. The last part of the name (*_task_TASKNUMBER_run_RUNNUMBER.csv) is an identifyer for the simulation and can for most purposes be ignored. The first line of each file is the header with items: time (dimensionless time of time-step) average_c (the volume averaged concentration in the simulation domain) L05 (the mixing region length in fractures and rock matrix with treshold c<0.05) Lm05 (the mixing region length in rock matrix with treshold c<0.05) Lf05 (the mixing region length in fractures with treshold c<0.05) L01 (the mixing region length in fractures and rock matrix with treshold c<0.01) Lm01 (the mixing region length in rock matrix with treshold c<0.01) Lf01 (the mixing region length in fractures with treshold c<0.01) L001 (the mixing region length in fractures and rock matrix with treshold c<0.001) Lm001 (the mixing region length in rock matrix with treshold c<0.001) Lf001 (the mixing region length in fractures with treshold c<0.001) num_fingers (the number of fingers in the domain) Each successive line gives the results of a time-step in the simulation.