[Mrsimple]

Hello there, I am new to StarCCM+ and I would like to gather some inputs regarding the work I am doing and the challenges I am facing.

The results I am pursuing is getting pressure and temperature profile of a subsea pipeline which is experiencing natural convection cooling. The pressure change I am expecting is the pipe losses.

Firstly I had create a pipe and assigned a material to the model in Solidworks. It is a simple 500m pipe with a assigned thickness. After which I had sent it over to starCCM+ by exporting as a parasolid.

<a href='http://postimg.org/image/y88igkd7h/' target='_blank'><img src='http://s22.postimg.org/y88igkd7h/Pipe_Picture.jpg' border='0' alt="Pipe Picture" /></a>

Over at StarCCM+
I proceeded to create the meshing models and I had chosen....

<a href='http://postimg.org/image/7n8dqje29/' target='_blank'><img src='http://s8.postimg.org/7n8dqje29/Surface_Meshing.jpg' border='0' alt="Surface Meshing" /></a>

After which I had adjusted the Mesh size to be "0.5"

Physics Model:


Phase 1 Physics Model: Methane, (CH4) was chosen as the gas

<a href='http://postimg.org/image/6oqtimdoj/' target='_blank'><img src='http://s13.postimg.org/6oqtimdoj/Phase_1_Model.jpg' border='0' alt="Phase 1 Model" /></a>

Phase 2: Pentane (C5H12), Hexane, (C6H14) and Water (H2O)

<a href='http://postimg.org/image/6ilw5e2xf/' target='_blank'><img src='http://s21.postimg.org/6ilw5e2xf/Phase_2_Model.jpg' border='0' alt="Phase 2 Model" /></a>

Mass Species Fractions was not tempered and set at [0 0 0] for the 3 components at initial value.

Also, I had adjusted the surface tension to be 24dyne/cm

<a href='http://postimg.org/image/q1hy4pt5p/' target='_blank'><img src='http://s30.postimg.org/q1hy4pt5p/Surface_Tension.jpg' border='0' alt="Surface Tension" /></a>

When the Meshing Models are completed, I proceeded to split the model by parts and assigning it into 3 components: Inlet, Outlet and Wall

<a href='http://postimg.org/image/shgq7652j/' target='_blank'><img src='http://s17.postimg.org/shgq7652j/Splitting_by_Parts.jpg' border='0' alt="Splitting by Parts" /></a>

Note: The pipe is hollow with open ends. Assigning them into regions

Inlet would be assigned to: Velocity Inlet
Outlet: Pressure Outlet
Wall: Wall

The values are put as default except the velocity is set at 10m/s and pressure to be 1.5 atm



Problems:
A floating point exception hasoccured: Floating point exception [ invalid operation]. The specific cause cannot be identified. Please refer to troubleshotting section of the User's Guide. Context: star.segregatedflow.segregatedflowsolver

For this problem, I had a problem finding the "Segregated Time Step" in the physics continua.
After inputting these values, I could not run the simulation because it says:

<a href='http://postimg.org/image/x6yfubzf7/' target='_blank'><img src='http://s29.postimg.org/x6yfubzf7/sum_of_mass.jpg' border='0' alt="sum of mass" /></a>

However I had adjusted the species mass fractions for initial conditions, Inlet and outlet region. However it does not solve the problem

[img=http://s23.postimg.org/g6dqxpw5z/Species_mass_fraction_constant.jpg]

I apologize for the lengthy post and any type of inputs are most welcome!!