The flow field and heat transfer investigation of water jet impingement on a solid block is numerically analysed for various Reynolds numbers using commercial finite volume-based method. The purpose of this simulation is to investigate the effect of Reynolds number on flow field and heat transfer. In the present investigation, it is observed that the reattachment length increases with the increase of Reynolds number. The number and size of vortices increase with the increase of Reynolds number. The horizontal velocity profiles for various regions in computational domain are used to predict where the flow gets developed. The bottom wall Nusselt number grows when the Reynolds number increases. The peak Nusselt number occurs at the stagnation point of jet impingement.Reference to this paper should be made as follows: Muthukannan, M., Rajesh Kanna, P., Ganesan, P. and Jeyakumar, S. (2018) 'A numerical simulation on the flow field and the heat transfer of water jet impingement on a solid block', Int. J. Computer Aided Engineering and Technology, Vol. 10, Nos. 1/2, pp.76-88. Biographical notes: Marimuthu Muthukannan received his Doctorate from Kalasalingam University in 2016. He has published six international journals and ten international/national conferences. His research area includes convective heat transfer and nanofluid heat transfer. Currently, he is working on enhancement of heat transfer in jet impingement. He is a recognised reviewer for international journals. P. Rajesh Kanna received his doctorate from Indian Institute of Technology Guwahati in 2006 and later Doctor of Science from Cracow University of Technology Poland in 2015. He has published more than 40 international journals and 20 international conference papers in the area of jet flow, flow over bluff body, porous medium, conjugate heat transfer, natural convection in room ventilation, nanofluid heat transfer, etc. Currently, he is working on nanofluid flow over bluff body, cavity flow using carbon nano tubes, etc. P. Ganesan received his doctorate from Kalasalingam University in 2015 and he is working as a Senior Assistant Professor in the Department of Mechanical Engineering, Kalasalingam University. He holds a BE in MechanicalEngineering and ME in Thermal Engineering. He has completed his Diploma in Mechanical Engineering and was awarded a gold medal. He has published 12 papers in international as well as national level journals and conferences. His research areas include energy and environment, heat transfer, artificial neural network, industrial energy and CO2 emission. He is a recognised reviewer for many leading international energy journals.S. Jeyakumar received his doctorate from Manonmanium Sundaranar University in 2007 He has published more than ten international journals and 12 conference papers in the area of jet flow, flow over bluff body, cavity flow, flow mixing, etc. Currently, he is working on high speed flow mixing, supersonic combustion, flow diagnostics, etc. This paper is a revised and expanded version of a paper entitled 'A n...