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Particle position undetermined first time step

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Old   March 4, 2009, 06:01
Default Particle position undetermined first time step
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Amine
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Hi, I am doing an unsteady particle tracking, and I get some particles position Undetermined (yp= -1.#IND00e+000), the particles position is calculated 10-18 times in one time step and this error occurs after calculating 2-3 steps during the first time step.

Has anyone encountred this error ?
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