Learning Forum

[jaiswal1706]

Problems I am facing:

1. Reverse flow at the outlet (I tried extending the domain, but to no avail.)

2. Maximum temperature/ pressure limited in....

3. Solution not converging, particularly the residual for continuity. Other residuals also take a lot of iterations for converging

Kindly find the details of the set-up here:

1. Steady State, Density-based, Axis-symmetric

2. Spalart Allmaras Turbulence Model with energy eqn on

3. Air modeled as ideal gas with Sutherland model of viscosity

4. BCs: (i) Pressure inlet, Gauge Total Pressure = (NPR*101325 - 101325) ; Supersonic/ initial Gauge Pressure = 5 Pa less than the total pressure; Total Temperature = 300 K.

(ii) Pressure outlet, Gauge Pressure = 0 Pa, Total Temperature = 300 K

(iii) Temperature of 300 K applied at walls

(iv) Operating Pressure = 101325 Pa

Details regarding mesh:

Structured mesh with 2,52,958 cells.

Avg. element quality = 0.79571, Min. element quality = 0.28747

Avg. skewness = 1.2058e-002, Max skewness = 0.35188

Avg. aspect ratio = 2.0994, Max aspect ratio = 6.7975

Avg. orthogonality = 0.99705, Min orthogonality = 0.85175

Kindly help me on this. I am also attaching the pictures of domain and mesh being used for the simulation.

[Rob]

Please add some images of the results. Note, the jump in cell size won't help but the problem may lie in the mesh resolution or initial conditions.