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May 13, 2016, 06:06 |
Incompressible flow at Reynolds number 100
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New Member
Kaushik
Join Date: Jan 2013
Posts: 1
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I am unable to give correct input parameters for simulating the flow past a circular cylinder with Reynold number 100. I have given the following inputs in my .cfg file
which I actually took from the test case suite % -------------------- INCOMPRESSIBLE FREE-STREAM DEFINITION ------------------% % % Free-stream density (1.2886 Kg/m^3 (air), 998.2 Kg/m^3 (water)) FREESTREAM_DENSITY= 998.2 % % Free-stream velocity (m/s) FREESTREAM_VELOCITY= ( 0.0008, 0.00, 0.00 ) % % Free-stream viscosity (1.853E-5 Ns/m^2 (air), 0.798E-3 Ns/m^2 (water)) FREESTREAM_VISCOSITY= 0.798E-3 The code is running but is not actually giving correct solution for Re=100. Since the flow is unsteady should we tamper with the following options for unsteady computations? % ------------------------- UNSTEADY SIMULATION -------------------------------% % % Unsteady simulation (NO, TIME_STEPPING, DUAL_TIME_STEPPING-1ST_ORDER, % DUAL_TIME_STEPPING-2ND_ORDER) UNSTEADY_SIMULATION=NO % % Time Step for dual time stepping simulations (s) UNST_TIMESTEP= 0.0015 % % Total Physical Time for dual time stepping simulations (s) UNST_TIME= 50.0 % % Unsteady Courant-Friedrichs-Lewy number of the finest grid UNST_CFL_NUMBER= 0.0 % % Number of internal iterations (dual time method) UNST_INT_ITER= 10 Also Wanted to know the basis of calculations for the input free stream parameter? Best Regards knk |
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