1) in the Inlet node you are prompted to choose a type of boundary condition, if you choose velocity then you must write down the value/expression of the velocity. That very value/expression must be multiplied by a time function which grows smoothly from zero to your desired final value, an example
Velocity:
11,1*step1(t)
You need to define the step1 function in the Definitions node of your model. You didn't do in the last model you uploaded.
In the Time Step node you are solving both the physics of your model, you need to check only the physics you are interested in. It seems the error is due to the fact that both Non-Isothermal Flow and Non-Isothermal Flow 2 boxes are checked, I would deselect the second one.
2) there is no way you can solve Re=220.000 with a laminar mode, what type of errors did you get with the turbulent one? I have been havign several issues too with the turbulent model I am quite interested in having some more infos.
I think it would better first look at these two issues before thinking about the high temperature and the long span of time you want to simulate.
Thanks for your prompt response.
Please note that :
1.Your first point is not clear regarding which step or what should be multiplied
2.First i was working on turbulent flow but not getting the right result so tried on laminar flow.
3.Inlet temp i.e Fluid temperature that is flowing inside with certain velocity have the temperature of 2200 deg C, It will heat up the refractory lining ( Brick of magnesite) upto a temp rage of 1600-1700 , so the usual temp range for the steel shell would be around 300- 500 degC
Please help me in this regard.
IShant
Some observations:
1) Your inlet velocity needs to be multiplied to a smoothly increasing function like 'step' so that the software can begin to solve from a 0 value and then reach a solution.
2) Your inlet velocity is 11 m/s and the inlet is 10 cm, coupled with the dynamic viscosity of your fluid, the corresponding Reynolds number is 220.000, i.e. fully turbulent flow, are you sure the velocity is that high?
3) Your inlet temperature is above 2200°C, steel is going to melt at that temperature, are you sure it needs to be that high?
PFA is the model .
Velocity:
11,1*step1(t)
You need to define the step1 function in the Definitions node of your model. You didn't do in the last model you uploaded.
In the Time Step node you are solving both the physics of your model, you need to check only the physics you are interested in. It seems the error is due to the fact that both Non-Isothermal Flow and Non-Isothermal Flow 2 boxes are checked, I would deselect the second one.
2) there is no way you can solve Re=220.000 with a laminar mode, what type of errors did you get with the turbulent one? I have been havign several issues too with the turbulent model I am quite interested in having some more infos.
I think it would better first look at these two issues before thinking about the high temperature and the long span of time you want to simulate.
Thanks for your prompt response.
Please note that :
1.Your first point is not clear regarding which step or what should be multiplied
2.First i was working on turbulent flow but not getting the right result so tried on laminar flow.
3.Inlet temp i.e Fluid temperature that is flowing inside with certain velocity have the temperature of 2200 deg C, It will heat up the refractory lining ( Brick of magnesite) upto a temp rage of 1600-1700 , so the usual temp range for the steel shell would be around 300- 500 degC
Please help me in this regard.
IShant
Some observations:
1) Your inlet velocity needs to be multiplied to a smoothly increasing function like 'step' so that the software can begin to solve from a 0 value and then reach a solution.
2) Your inlet velocity is 11 m/s and the inlet is 10 cm, coupled with the dynamic viscosity of your fluid, the corresponding Reynolds number is 220.000, i.e. fully turbulent flow, are you sure the velocity is that high?
3) Your inlet temperature is above 2200°C, steel is going to melt at that temperature, are you sure it needs to be that high?
PFA is the model .