Collision of 2 jet streams

Update: March 16, 2018
OpenFOAM 4.x

Case directory

$FOAM_TUTORIALS/lagrangian/MPPICFoam/injectionChannel

Summary

Air flows in from the 2 inlets, "lowerInlet" and "upperInlet", with velocities of (18.7939, 6.8404, 0) m/s and (18.7939, -6.8404, 0) m/s, respectively, and collides in the flow path. After the collision, the flow flows out of the calculation domain through the outlet. The total calculation time is 0.1 second.

Model geometry Model geometry

The physical properties of discrete particles are defined in the file "kinematicCloudProperties" in the directory "constant". The position of particle inflow, inflow start time, inflow duration, velocity, size distribution, etc. are defined in "injectionModels" of "subModels" as model1 and model2, respectively, as shown below.

injectionModels
{
	model1
	{
		type            patchInjection;
		parcelBasisType fixed;
		patchName       lowerInlet;
		U0              (18.7939 6.8404 0);
		nParticle       1;
		parcelsPerSecond 1390885;
		sizeDistribution
		{
			type        normal;
			normalDistribution
			{
				expectation 650e-6;
				variance 25e-6;
				minValue 500e-6;
				maxValue 800e-6;
			}
		}
		flowRateProfile constant 1;
		massTotal       0;
		SOI 0;
		duration 60;
	}

	model2
	{
		type            patchInjection;
		parcelBasisType fixed;
		patchName       upperInlet;
		U0              (18.7939 -6.8404 0);
		nParticle       1;
		parcelsPerSecond 1390885;
		sizeDistribution
		{
			type        normal;
			normalDistribution
			{
				expectation 650e-6;
				variance 25e-6;
				minValue 500e-6;
				maxValue 800e-6;
			}
		}
		flowRateProfile constant 1;
		massTotal       0;
		SOI 0;
		duration 60;
	}
}

The meshes are as follows, and the number of mesh is 9776.

Mesh Meshes

The calculation result is as follows.

Discrete particles's motion (After the start of particle inflow, the color represents velocity)
Discrete particles at 0.001 sec Discrete particles at 0.001 sec
Discrete particles at 0.005 sec Discrete particles at 0.005 sec
Discrete particles at 0.01 sec Discrete particles at 0.01 sec
Discrete particles at 0.02 sec Discrete particles at 0.02 sec
Discrete particles at 0.1 sec Discrete particles at 0.1 sec

The flow field at the final time is as follows.

Flow velocity at 0.1 sec (U) Flow velocity at 0.1 sec (U)
Pressure at 0.1 sec (p) Pressure at 0.1 sec (p)

Commands

cp -r $FOAM_TUTORIALS/lagrangian/MPPICFoam/injectionChannel injectionChannel
cd injectionChannel

blockMesh
MPPICFoam

paraFoam

Calculation time

13 minutes 27.9 seconds *Single, Inter(R) Core(TM) i7-2600 CPU @ 3.40GHz 3.40GHz