diff --git a/crates/specialized/rtx-cfd/src/turbulence/k_epsilon_gpu.rs b/crates/specialized/rtx-cfd/src/turbulence/k_epsilon_gpu.rs
index 6a50f82..3abe407 100644
--- a/crates/specialized/rtx-cfd/src/turbulence/k_epsilon_gpu.rs
+++ b/crates/specialized/rtx-cfd/src/turbulence/k_epsilon_gpu.rs
@@ -447,7 +447,7 @@ impl KEpsilonGpuModel {
 
         self.kernel_manager
             .stream()
-            .memcpy_dtoh(&mut eddy_viscosity_host, &buffers.eddy_viscosity)
+            .memcpy_dtoh(&buffers.eddy_viscosity, &mut eddy_viscosity_host)
             .map_err(|e| {
                 CfdError::gpu_error(&format!("Failed to copy eddy viscosity from GPU: {}", e))
             })?;