Task. The non-isothermal flow of oil in the turbulent regime flows in the buried oil pipeline, initially as a Newtonian fluid. The composition of oil contains paraffin, while the temperature is high, oil is a Newtonian liquid. After some distance oil temperature in buried oil pipeline decreases due to surrounding soil (earth) temperature. At decreasing oil temperature viscosity increases. Oil begins non-Newtonian liquid. . At decreasing oil temperature near walls of pipeline appears “Dead Zone” (Near walls oil doesn’t flow. Only in the center of pipeline oil flows). The flow structure is represented as follows: 1) In the beginning of the pipeline Newtonian fluid flows in the turbulent regime; 2) After some distance oil temperature decreases slowly due to viscosity increases. Fluid properties change from Newtonian flows in the turbulent regime to non-Newtonian flows in the laminar regime; 3) Between the flows of Newtonian and non-Newtonian oil happens a transition zone. I need to get two-dimensional axisymmetric results. I need velocity profile, pressure drop, temperature profile, viscosity profile. I want to compare experimental data with numerical results. Pipeline length 331000 meter. Pipeline diameter 0.82. How can I simulate such a long pipeline in two dimension? Can simulate this task in Comsol Multiphysics or Ansys Fluent? Should I solve this task in dimensionless form if yes How to solve it?
ANSYS Fluent is always solving the equations with assigned dimensions. If intended, the results can be made dimensionless afterwards in the postprocessing e.g. in CFD-Post by using expressions.
ANSYS Fluent has a 2d radial-symmetric solver mode.
But it is rather not possible to start a simulation in a fully turbulent regime using RANS with a turbulence model and to change in the same identical fluid domain to a flow simulation without a turbulence model. Potentially with some customization the behavior of the turbulence model could be influenced such, that the produced eddy viscosity becomes under defined circumstances comparable low, so that under these circumstances the turbulence model looses its effect on the simulation and so it would become effectively laminar flow simulation.
Regards,
Dr. Th. Frank.
Hello Dr. Th. Frank. Thank you for your response! How can I simulate 331 kilometer pipe in Ansys Fluent in two dimension? It is a so long pipeline.
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