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divergence-free velocity field - 2D problem

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Old   May 30, 2008, 11:23
Default divergence-free velocity field - 2D problem
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I took the velocity gradients for the solution of 2D flow in the DEFINE_ADJUST() as below

dudx = C_U_G(c,t); dvdy = C_V_G(c,t);

DIV = dudx + dvdy;

and I obtained the values of DIV different than zero. How this is possible? Is there any kind of numerical error here?
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Old   May 31, 2008, 12:28
Default Re: divergence-free velocity field - 2D problem
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In order to complete my question I have to mention that the velocity gradients were defined in the following way:

dudx = C_U_G(c,t)[0]; dvdy = C_V_G(c,t)[1];

DIV = dudx + dvdy;

this results in non-zero values of DIV ?

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