Error: Update-Dynamic-Mesh failed. Negative cell v

kim

Hi,

I am trying to illustrate the inclusion accumulation process on the nozzle's wall while liquid steel containing very small alumina particles flow through the nozzle(SEN of steel continous casting). The clogging always occurs when enough inclusions accumulate on the wall . As the accretion is grwoing up on the wall, the nozzle's profile will change and therefor affect the liquid steel flow in the nozzle.

I would like to calculate the nozzle wall's profile while accretion is occuring by using dynamic mesh method. The movement of nodes depend on the accretion rate resolved by DPM's udf. After hundreds of iteratiing, the results seem exciting. The shape of walls has been changed, some small bumps are produced on the boundary wall which could stand for initial clogging. However, as the calculation proceeds, error message "Error: Update-Dynamic-Mesh failed. Negative cell volume detected". I have tried several times to adust the parameters in panel "dynamc mesh". It seems that this it does not work.

In my case, the moving zones are nozzle's walls which are define by UDF of DEFINE_GRID_MOTION ().

I would appreciate it very much if you could give me some idea to overcome this problem.

Sincerely,

kim