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non-physical solution with periodic boundary in ccm+ |
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August 12, 2009, 15:53 |
non-physical solution with periodic boundary in ccm+
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Arihant
Join Date: Aug 2009
Posts: 2
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Hi,
I am testing starccm+ for simulating fully developed laminar flow in a rectangular channel and circular pipe. I am using the periodic boundary condition and I am getting non-physical results. I created a Periodic interface by selecting the inlet and outlet boundaries. I selected Fully developed Interface as the property under Interfaces node and selected Pressure Jump under Physical Conditions node and specified a Pressure Jump value under Physical values. I am using Segregated solver with 0.001s as timestep. I am simulating a Reynolds number of 100. Channel dimensions are 3cmx3cmx10cm. I specified Pressure jump from \Delta P = \rho f L u^{2}/2D_{h}, where f = 64/Re (probably not true for rectangular channel but just as a test) and Hydraulic dia. D_{h} = 4*Area/Perimeter = 3cm. Density of water is 1000kg/m^3. So, \Delta P = 10.67 Pa. for an Avg. velocity (u) of 0.1m/s After about 400 iterations there is reversal of flow in the entire domain which is non physical. I changed the Fully developed flow option to Mass Flow rate and specified a Mass flow rate of 0.2 kg/m-s. This time there is flow from center of channel to both inlet and outlet which again is non physical. Am I missing something in specifying Periodic boundary condition ? Can any one point out where I am doing wrong. Thanks, Arihant. |
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periodic boundary, starccm+ |
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