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Temporal Mean and Residuals per layers from 3d result?
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Temporal Mean and Residuals per layers from 3d result? 9 years 1 month ago #16071

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Dear Users,

In 2d there are options to extract Surface Temporal Mean and Residuals. With 3d results I can extract layers and look at the velocity results per each layers. Is it possible to extract the Temporal Mean and Residuals from selected layer, as it is not activated I am afraid. Or maybe there is another way to download all velocity values for each node for all time steps as txt file, so I could calculate it myself. Please advise. Thank you.

Kind Regards!

Violet
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Temporal Mean and Residuals per layers from 3d result? 9 years 1 month ago #16073

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Hi Violet,

Have a look at "Tools->Extract Layer".
The result of this operation can be dealt with as any 2D result.

Hope this helps... Martin
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Temporal Mean and Residuals per layers from 3d result? 9 years 1 month ago #16079

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Hi Martin,

Thank you for your reply. The Temporal Mean and Residual extraction working fine with 2D results. When I move to 3D result file and Extract any layers I wish, then it works fine as well. My problem is to Compute the Temporal Mean and Residual from extracted layer itself. Looks like it works on 2D surface layer only, but it cannot be performed on extracted layer. I can view velocities for each layer, but I cannot calculate the mean or even download all velocity values as text or other files for all time steps, so I could compute it myself. I hope there is a tool for that and I am just not aware of it, as previously I have been using quickplot, but now discovered how many nice tools BlueKenue has. To extract the Temporal Mean from 2D result the file contains UV velocities only. When I extract the layer from 3D result and then view it in 2D, the result file still contains UVW velocities and Temporal Mean formula probably cannot perform as it has to take into account W velocity. However, I can compute Residual and Mean from whole 3D domain but I really need it for each layer separately. Please advise. Thank you in advance.

Kind Regards!

Violet
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Temporal Mean and Residuals per layers from 3d result? 9 years 1 month ago #16104

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Hi Violet,

On the "Extract Layer From..." dialog make sure you choose "All Frames" as the "Frame Option".

The resulting object is a 2D result. (in spite of it being called "VITESSE UVW (Layer ##)".
When you select this new object the "Tools->Extract Residuals" and other temporal extraction tools will work properly.

Hope this helps... Martin
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Temporal Mean and Residuals per layers from 3d result? 9 years 1 month ago #16106

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Thanks Martin, you were writing to me at the same time as I did. What a coincidence! Thank you, yes I got it accidently, just pressed without thinking:).

Can you give me some hints on how is Residuals calculated. Thank you very much.

Kind Regards!

Violet
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Temporal Mean and Residuals per layers from 3d result? 9 years 1 month ago #16105

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HI Martin,

I got it, it is working fine. When I extracted the layer from the 3D result, I had to chose all frames. After that step the Residual and Temporary Mean options became activated for extracted layer. It is great!

Just a quick question. Do you know how Residuals are calculated in BlueKenue. I understand how the Mean(average) flows are computed, but not really Residuals. It should be subtraction, but is it subtraction averaged or something else? Thanks in advance.

Kind Regards!

Vioelta
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Temporal Mean and Residuals per layers from 3d result? 9 years 1 month ago #16107

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Here is the code:
CSpatialObject *CT32DVector::ExtractResidualMap(int start, int end)
{
// Can we do this??
	if(GetFrameCountTotal() < 2)
		return NULL;

// Store the current file position
	int currentFrameCounter = GetCurrentFrameCounter();

// Go to first frame
	JumpToFrame(1);

// Setup data, initialize all values to 0.0
	double *uMean = new double[m_NodeCount];
	double *vMean = new double[m_NodeCount];
	int i=0;
	for(i=0;i<m_NodeCount;i++)
		uMean[i] = vMean[i] = 0.0;

// Scan all records
	double total = 0.0;
	int frame = 1;
	do{
		if(start <= frame && frame <= end)
		{
			total += 1.0;
			for(i=0;i<m_NodeCount;i++)
			{
				uMean[i] = uMean[i] * (total-1.0)/total + m_u[i]/total;
				vMean[i] = vMean[i] * (total-1.0)/total + m_v[i]/total;
			}
		}
		frame++;

	} while(FrameForward(1) && (frame <= end));

// Create the new object
	CT32DVector *newObject = new CT32DVector;
	newObject->CopyFrom(this);
	newObject->SetFrameCountTotal(1);

	for(i=0;i<m_NodeCount;i++)
	{
		newObject->m_u[i] = uMean[i];
		newObject->m_v[i] = vMean[i];
	}

// Clean up and get out
	delete [] uMean;
	delete [] vMean;
	JumpToFrame(currentFrameCounter);

	return newObject;
}
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Temporal Mean and Residuals per layers from 3d result? 9 years 1 month ago #16108

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Thanks a mil Martin.

Kind Regards!

Violet
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Temporal Mean and Residuals per layers from 3d result? 9 years 1 month ago #16220

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Hi Martin,

I hope you are doing well. Just a quick question. Do you know if there is an option to re-scale the grid of residual flow extracted from any layer. So far it shows velocity vectors for each node, and since my domain is huge it is hardly to see the direction of the vectors. If I wish to look at velocity vectors then there is an option in Properties/Arrow scale to re-scale the grid, but I could not see anything similar when I look at the residuals per layer. Thanks in advance.

Kind Regards!

Violeta
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Temporal Mean and Residuals per layers from 3d result? 9 years 1 month ago #16241

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Hi Violeta,

The extracted layer is the same as any other 2D result so to scale the arrows you have to change the "Scale" value at the top right of the "Properties:Display" tab.

Hope this helps... Martin
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Temporal Mean and Residuals per layers from 3d result?

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