[project4]

Hello everyone,
i'm trying to simulate the leidenfrost effect under a water droplet using the critical heat flux boiling model. i keep having the error "computed saturation temperature <=0" when i try to initialize and i didn't manage to find how FLUENT calculate this temperature or how to solve this issue.

Does anyone ever encountered this problem or know how to solve it?

Thanks in advance

[bbarbier07]

Originally Posted by project4

Hello everyone,
i'm trying to simulate the leidenfrost effect under a water droplet using the critical heat flux boiling model. i keep having the error "computed saturation temperature <=0" when i try to initialize and i didn't manage to find how FLUENT calculate this temperature or how to solve this issue.

Does anyone ever encountered this problem or know how to solve it?

Thanks in advance

Hi, I am dealing with the same error when I want to compute the saturation temperature in function of pressure with a UDF for a VOF simulation with evaporation-condensation model, have you managed it ? Thanks in advance.

[xiaowei]

Originally Posted by bbarbier07

Hi, I am dealing with the same error when I want to compute the saturation temperature in function of pressure with a UDF for a VOF simulation with evaporation-condensation model, have you managed it ? Thanks in advance.

Hi bbarbier07, you should input the T_sat-Pressure correlation as a piecewise-polynomial (indentify the valid range of the correlation ), rather than a pure polynomial, then the problem can be fixed. I guess it's because some cells are intialized with a small pressure value, so that the polynomial may caculate a negative T_sat at the begaining of the interation, which causes the error.

[qingqingliu]

Originally Posted by xiaowei

Hi bbarbier07, you should input the T_sat-Pressure correlation as a piecewise-polynomial (indentify the valid range of the correlation ), rather than a pure polynomial, then the problem can be fixed. I guess it's because some cells are intialized with a small pressure value, so that the polynomial may caculate a negative T_sat at the begaining of the interation, which causes the error.

I am simulating flow boiling of water and also met the issue, Error at Node 0: The computed saturation temperature <=0.0. where is the T_sat-Pressure correlation?

[THX]

Originally Posted by qingqingliu

I am simulating flow boiling of water and also met the issue, Error at Node 0: The computed saturation temperature <=0.0. where is the T_sat-Pressure correlation?

do you have any ideas？