how to change eq. variables? -- CFD Online Discussion Forums

September 16, 2002, 07:52	how to change eq. variables?	#1
j_goldie Guest Posts: n/a	I have to change velocity components after each time step: u = u + rand(+-0.1u) in every cell in domain. I tried to find the solution in Fluent's manual, but all I could find was how to change BCs, material properties etc, which is not satisfactory for me. How to access and modify flow variables using UDF? Any other way? I need this for a flat channel flow simulation in LES, with very low given Re (Re_t=2000), which allows inflow velocity of only 1 m/s. Therefore I must force turbulent flow by modifying velocity, as shown above. Thanks in advance.

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