Due to recent bot attacks we have changed the sign-up process. If you want to participate in our forum please send a message via our contact form. › Forums › OpenLB › General Topics › Storing velocity data in csv file › Reply To: Storing velocity data in csv file July 1, 2021 at 10:36 am #5767 AdrianKeymaster The increment operation in the nested loop contains a typo, it should be ++latticeR[1].