Error #001100279 Floating point exception: Zero divide
Dear all,
Now I have simulated the warehouse size 20*20*30 meters. It is quite big. I need to simulate and monitor the air temp in the warehouse (10 h). I work with transient model with time step = 1 hour. But I face with error as above Error #001100279 Floating point exception: Zero divide The software is Ansys 14 CFX. CPU core i5 with RAM 6 gb Please help . Thank you 
What influenced you to choose a 1 hour time step? That's probably several orders of magnitude too big!

FAQ: http://www.cfdonline.com/Wiki/Ansys...do_about_it.3F
But Erik is right  your time step is miles too big. 
In your warehouse do you have buoyancy driven flow?
In the CFX manual it tells you how to estimate the time step. If you're doing transient simulations you might want to consider adaptive time stepping. Set the maximum time step to something like 1hr and the minimum to something small like 1e8s and try to converge within 510 loops. 
Agreed, adaptive timestepping is the best choice  especially for beginners who have no idea of what timestep is really required. I would say that half the convergence problems we see on this forum are just from too large a timestep.
For most simulations 35 coeff loops is more appropriate. 510 is only required for models with tricky physics to converge suck as multiphase (but for most multphase models I still use 35). 
Quote:
Would you consider buoyancy driven flow to be "tricky". 
No. 'Tricky' means in this case where complex coupling between phases/physics is required; such as 2way coupled particle tracking, eularian particle models, chemistry, radiation modelling where the fluid flow interacts 2ways with the radiation modelling and things like that.
Buoyancy is still single phase so that is best done with short time steps converged quickly  so 35 coeff loops per iteration. 
Thank you all. I will try follow your suggest. Thank you again.

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